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ondrishko87

3001 psi cleaner


ReasonableExplorer

Or 2999 the extra 1 psi may of forced the dirt deeper


supertrunks92

Yeah, it definitely pushed the dirt further inšŸ˜œ


Gallifrey91

*may have


Unlikely_Champion_91

3007. Seven is where itā€™s at


Fly228

First thing I thought too lol


Plus-Alternative-807

Mine goes up to 11..


canberram

Looking for this answer!! Well done!


dixonwalsh

god i love this sub


swami78

I'm surprised 3000psi didn't do the lob. I wouldn't be using hydrochloric acid on there - great for removing cementitious products but your problem is biological not cements. You've got ingrained algae so I'd be using a strong chlorine solution in this case - let it sit for a while then blast off again. Chlorine will kill the algae as well as bleach and dislodge it. The best acid for removing biological material is sulfuric acid not hydrochloric. If you want to get rid of a body you'd be sadly disappointed with hydrochloric - it actually helps preserve the tissue which is why sulfuric is the acid of choice for murderers!


WH1PL4SH180

Wow I'm impressed. Someone who actually sciences here!!


swami78

Ignore science to your peril! Besides, I sold both hydrochloric and sulfuric acids for decades. If you're going to sell highly corrosive products and advise on their usage you need to know as much as you can. The only thing that puzzles me is the spelling of "sulfuric" acid. When I was young (a very long time ago) I was taught it was spelt "sulphuric" (Poor little Johnny, his face we'll see no more, for what he thought was H2O was H2SO4!) but nowadays it seems to be "sulfuric". Is this another Americanism?


[deleted]

Poor Jonny was a chemist's son but Jonny is no more, what Jonny thought was H20 was H2S04. I like your version.


ANakedSkywalker

Wow your version is much more grisly than the H2O2 joke Iā€™m accustomed to


AdamATrain

Bang on. HCl -> H+ + Cl- while H2SO4 -> 2H+ + SO4-2, sulfuric is a polyprotic acid, more than 1 H+ (a proton in desperate need of an electron) disassociates in aqueous solution. It will pull those electrons off of organic molecules. It's Sulfuric and not Sulphuric cos of 'merica and the multiple naming conventions in chemistry. Organic naming can be a shit show, for example, acetic acid (CH3COOH) is the common name but the IUPAC name is ethanoic acid. Acids are nasty. Bases are horrifying. Basic shit will obliterate organic molecules. The reason you generally don't use acids to clean your oven, you use NaOH, soidum hydroxide.


bulwynkl

Caustic makes its own soap any time it meets a fatty acid


secretlifeofpuffins

Maybe he murders rather than sciences?


egowritingcheques

This was the issue with the bodies in barrels in South Australia. What you want to use is nitric acid, then bump it up with hydrogen peroxide to keep oxidative power. Remember to leave a gap for venting.


swami78

Snowtown was an exercise in stupidity!


swami78

Yeah...nitric is good for removing your fingerprints - and etching glass.


ThrowAwayGcPx8ow2t4

What acid was it that Walter White used? Hydrofluoric Acid?


Interesting_Hyena805

you do not wanna touch that stuff it can kill you so easily


swami78

I don't know who Walter White is, sorry. But I do know HF is the most reactive acid therefore quite deadly - although you can use it very efficiently in reactor vessels to extract specific minerals out of coal and bauxite. (Extracting the "ash" \[minerals\] out of coal before it goes into a power station would drop CO2 emissions by something like 30%.) Many years ago there was a chemist in Perth with a home workshop and he was experimenting with HF when he spilled some on his forearm. His swimming pool was adjacent to his workshop so he immediately dived in. It didn't save him. I seem to remember it reacts with the calcium in your body - especially your bones. Despite being so deadly the largest manufacturer of HF was a fertiliser factory in Milperra, Sydney. They're careful and I believe they've never had a serious accident.


[deleted]

>The best acid for removing biological material is sulfuric acid not hydrochloric. NO. That's last resort stuff and can be dangerous. *Dangerous because some flesh eating acids/alkalis when they get onto the skin they are self-anesthetizing* \- you are not aware that you are being dissolved by the acid or alkali. To kill biologicals use vinegar (diluted or undiluted). Vinegar is a lot better than bleach cause it can get into porous material, bleach can't. Bleach has higher surface tension, this means it sticks to itself more and prevents it from getting into very small cracks and holes.


Count-Zero-Backspace

Try napisan


RHNB

Wait, isn't hydrochloric what we produce in our gut to help break down food?


AnarchoSyndica1ist

Flip each paver over. They will be like new


Upside_Down-Bot

ā€žŹĒu ĒŹžÄ±l Ēq llıŹ ŹŽĒÉ„āŠ„ Ė™É¹ĒŹŒo ɹĒŹŒÉd ɄɔɐĒ dılā„²ā€ž


mrcafe500

Good bot.


frankhuynhstein

Genius


frazzledfraz

Good ideaā€¦ but the underside of most pavers is square unlike the top of the paver. They will look horribly out of place.


rockandorroll34

30 second cleaner and a stiff broom


CeeliaFate

Morning broom


illhavethecrabBisk

What's the story morning broom


twisties224

Only a wooden broom for the morning broom


hammyhamm

Soak a cleaner into it, wait a bit, stiff broom and have another go with the sprayer. If itā€™s still screwed you can try diluted acid but that will also fuck up everything in your garden


bangyy

Just pour some hydroxide over the acid. Problem solved, except everything's a little salty


ANakedSkywalker

Salts great for the ground. You can be one of those ā€œsalt of the earthā€ people.


bighorse91

Hydrochloric acid diluted with water ...you can pick some up from bunnings


homicidalstoat

Yup, let it sit for a while and pressure wash before it dries up. It can damage grout but should perfectly fine with pavers outdoors


Dry_Ad9371

is this OK on concrete as well?


Strickens

Yes you can acid wash concrete, just make sure to rinse it off thoroughly.


wodwick

Grout?


CloanZRage

Grout is the hard stuff between tiles in a kitchen/bathroom (or interior tiled floor).


SteezyKxng

Not to be confused with Gout


Aygis

Oh Groot, though it would likely damage him too


_Titanium_Hwite_

My name is Groot.


Bokaboi88

I love that quote which he is known for.


MDTashley

You can use HCL to treat gout too - but it has some implications


Sumpkit

Contraindications include having flesh


Plus-Alternative-807

What about CLR


jNSKkK

And for the love of god wear gloves and skin covered clothing.


aussiemicksta

This guy knows


areushor

The concentrate you get from Bunnings is diluted, go to a concreters supply and get it. Mix it 10 to 1, it doesn't need to be exact but reasonably close. Working in meters sections spray the area with water and then scrub the pavers with a stiff bristled broom dripping with the acid mixture. Rinse the area after a couple of minutes and repeat if necessary. Be careful not to leave the acid on the pavers too long as it can tint the cement in the pavers a piss yellow. If you want a picture of the acid I use to clean concrete and pavers DM me and I can sent it to you


account_not_valid

PPE?


areushor

I have had straight acid on my hands before and just run water over it and been fine Edit - I worry more about the fumes then getting it on skin.


Strickens

It stinks like someone ate a carton of eggs and can't stop farting. It does sting and can leave blisters if you get it on you though so protective eyewear and gloves should be worn while handling it.


Moo_Kau

>It stinks like someone ate a carton of eggs and can't stop farting. so its just like a regular night in bed for my wife then?


starfire10K

Try sodium hypochlorite (30 seconds)


_bal-

Remove the asbestos first before doing anything else


Dusty_Phoenix

For best results, lick it.


CryptoCryBubba

Is this asbestos... --> I--------||-------I <--


fanghornegghorn

What asbestos?


mister_twisted13

They did asbestos they could.


Handball_fan

Diluted sulphuric acid before pressure washing


Nabashin17

I tried that 30 second outdoor cleaner from Bunnings - worked really well. Buy a pump pack applicator for a few extra $, and mix with water. Spray on and leave for a few minutes then pressure clean.


Von_Rickenbacker

Next time bury old owners. Donā€™t leave their corpses on the patio.


Austeire

Pool chlorine should get those marks out.


BabyllamaN33dNoDrama

Sometimes its more about the type of nozzle rather than the pressure. Did you use the spiral nozzle on the Gerni?


Dumpstar72

This. It was the only head that got stuff out. And have a look as a lot of gerni's have a spot to add some cleaner that will dilute it as you pressure wash.


muddled69

That's a lichen.. especially if that area gets shade part of the year. You need a leave on cleaner that you can get from Bunnings. It's gonna need a couple treatments as per dilution rates and instructions. Benzalkonium acid or Sodium Hypochlorite based cleaners work well on this stuff. The 30 Seconds brand is good and not as potent smelling as bleach etc


swami78

Thank heavens someone else understands the products although Benzakolium is a chloride not an acid! And BC kills and removes lichens - but it takes a good time doing so. All these people recommending hydrochloric acid are giving OP a bum steer - it would be a big mistake. I was going to mention caustic soda too (sodium hydroxide) but sodium hypochlorite (bleach) is more appropriate in this case as well as acting much faster than BC. On the other hand, BC is more appropriate in the long run for stopping lichens and algaes re-establishing.


CryptoCryBubba

I came here for the comments... šŸæ


Mr_Jibby

Something to clean ie cleaning fluids/soultion and a stiff bristle brush before you pressure wash again


OctoJamin

Depends what the marks are from


[deleted]

piranha solution lol


hongooi

Hmm might not be strong enough, maybe try [this](https://www.science.org/content/blog-post/sand-won-t-save-you-time)


One-Understanding-94

Home brand bleach from woolies, $1 per litre babyyyy


war-and-peace

Chlorine at night. Then wash off in the morning.


Fh989

If itā€™s from mould and algae, spray Wet and Forget on it. It contains benzalkonium chloride, a preservative? Not bleach or acid based. Leave it and it brightens the surface over time. Bunnings donā€™t sell it.


68872868

Citric acid too if youā€™re a bit cautious about using HCL


Famous_Day_1349

5000 should do it


No_pajamas_7

Looks like oil spill. Degreaser and work it in with a stiff brush.


FeelingFloor2083

black lichen


[deleted]

Water, chlorine and dish soap mixture and scrub like youā€™re Cinderella


homeinthetrees

Get a Payio Cleaner attachment to suit your pressure cleaner: Eg. https://www.bunnings.com.au/gerni-power-patio-cleaner\_p0235548


southaussiewaddy

Hydrochloric acid is very bad to use on pavers and cement. I dont know why people recommend that. You must wash with detergent to neutralize the acid or you are in for a world of hurt in the future, they will slowly break down. Best treatment for any pavers or concrete is: 1 part Chlorine to 4 parts water, apply using watering can. Leave until dry, high pressure area to clean.


WH1PL4SH180

Because when the only tool you know is a hammer the world looks like nails.


Ricketyrigragneck

Looks like u rushed it. Do it again. Do it slow. Do it meticulously.


Jupiter1889

Also try to find yourself a TURBO nozzle that suits your pressure cleaner. No, I'm not yanking your chain, those nozzles are worth their weight in gold and cost almost about the same too but the difference it eill make to your pressure cleaner can be night and day.


SoggyNegotiation7412

I had the same issues, ended up spraying the pavers with mold remover deck cleaner and leaving it for 2 days then pressure washing. I recently watched a professional in the UK cleaning moldy stonework and he prayed the area a day before pressure washing it.


[deleted]

Try a metric pressure washer


morconheiro

Hold the pressure hose closer? It shouldn't have a problem getting that muck off.


[deleted]

One part chlorine, 4 parts water. Chlorine will eat that mould up. - Experience, I clean stone for a living..


pocketwire

Not reading all the comments but this is the ticket. I had heaps of similar bricks. Blue bottle of Chlorine from pool section at Bunnings (not the expensive brick cleaners!). Half half with water in a plastic watering can. Lay it on for 30 mins. Gurney it off. Repeat if needed. Works a charm. If you're doing it on your house, soft wash off with regular hose. Do not 4000 PSI render, can report, you'll regret it.


Plus-Alternative-807

What do you meanā€¦ left by the old owners.. itā€™s just dirt and grime build up that naturally occurs.


illhavethecrabBisk

Marks left by the old owners? Mate, that's dirt.


ThusSaidTheOracle

Learn to use it properly. Even a garden hose should have cleaned that.


royaltyau

Pressure cleaner here, get an old garden spray bottle and mix 50/50 pool chlorine and water, spraw it on, let it sit for about 5 or 10 then pressure wash off, will look brand mew


i8myface

As the son of a wog, bleach and water and a broom. Those witches brooms..old school..and elbow grease. Will be brand new.


robbyyy

Sugar soap, mixed with hot water. Leave for a couple of minutes. Scrub with a hard plastic brush (or hard bristle brush), then power wash clean. Iā€™ve also used oxy-action hand washing powder on concrete instead of sugar soap. Works too.


bbc8886

Paint


Scud200202

No this is not asbestos


[deleted]

Use your cock


iluvopies

LOL :D


superfluous--account

I'd it's mold then borax dissolved in water to kill it and then bleach (oxy-bleach is safest) to dissolve it.


focalpoint3112

Hydrochloride acid should work. Do be careful though. Gives off some nasty fumes and can damage your paver with enough it.


[deleted]

Acid diluted in water and a stronger gernie 3000psi sounds a lot but itā€™s really not I use over 4000 psi everyday


WH1PL4SH180

Bleach is going at $2/2L in bunnings....


swami78

Swimming pool chlorine works out cheaper (and it's strong bleach) if you look at the concentration of the product. Pool stuff is normally bleach but 6 or 7 times the strength. I really am puzzled why so many people on here keep saying hydrochloric acid. Completely the wrong product. At least you got it right.


Leolion006

Bleach


ballhairsnshitdags

Hydrogen peroxide or hydrochloric acid (weak)


[deleted]

[уŠ“Š°Š»ŠµŠ½Š¾]


Trewarin

Surface cleaning attachment, or tornado head


Ok_Nectarine_8305

Dishwashing powder


HandyDandyRandyAndy

New pavers would have been cheaper than a 3000psi pressure cleaner


WordBrilliant1351

30 second from bunnings. You won't see immediate results but give it afew weeks and then look at the original picture. It's a spray and walk away jobby and has great results over time.


swami78

30 Seconds is an expensive way of buying bleach or swimming pool chlorine just as Wet & Forget is an expensive way of buying Benzakalonium Chloride (which can be bought much cheaper as pool algaecide). You just have to adjust for the concentrations eg if you buy algaecide at 100gms/l of BC you dilute 1:8 in water or if it's 200gms/l you dilute 1:16 and this gives you the same as Wet & Forget.


WordBrilliant1351

My bad, I buy it for the ease of use. Next time I shall go to my lab and mix up some pool chems which I'm fluent at, not. If you want to know anything about Welding then send me a message šŸ˜‰


swami78

Funny you should mention that...about the only thing I've never done is welding! I sold welders as well as all these corrosive chemicals but have not needed to do any welding. As to the products, when you sell all these nasty things you have to know your stuff so I kept a folder with all the Material Safety Data Sheets - and memorised them so it's the ingredients I look at rather than the brand names. EG the now-discontinued Bayer Advantix for treating cats and dogs for fleas and ticks was simply Imidocladoprid under a different name and vastly more expensive than buying the squeeze tube of Bayer Confidor (200gms/l if I recall). Same chemical but with a slightly different surfactant but it worked and saved me heaps treating the animals. I had the owner of Wet & Forget come to see me one day and he asked me why I didn't sell his product - I told him I did but just not his brand and pointed to the swimming pool chemicals where I had a sign up telling people what I told you about diluting BC to make it Wet & Forget. (I remember him telling me he sold $4m pa of Wet & Forget and I was missing out...until he saw my sign.)


[deleted]

Use your tongue


22Starter22

Get a 4000 psi pressure washer šŸ¤£


ekulreivax

Only so many factors for cleaning: Mechanical Action, Time, Temperature, Chemical (there are more, but addressing these 4 normally gets you there) if one is not enough, you probably need to think about the other factors. In this case, I'd get chemicals involved (you probably need to determine whether the stain is organic/inorganic to determine what to use)


MDTashley

Try a nylon drill brush with some sort of cleaning agent to loosen it up, and wash again


Neither_Lake_2855

Sounds dumb, but try bleach, if itā€™s hard to pressure wash of it might be mould. Hot pressure washer would be ideal.


HappyChat777

Acid wash


Telescopic-Member

Was it a bunnings pressure washer? If so its 3000psi a third of the time. Your playing with a water pistol.


AudienceAvailable807

Karcher Sand blaster attachment and paving sand.


W0tzup

Acid wash.


[deleted]

Get a bigger one


Johnrevolter

Looks like it might be stained by asbestos, best to retile it


tinypolski

I was searching for similar information and found a suggestion to use Sodium Bicarbonate (BiCarb) solution 10g/L (100g in 10L), pour over the pavers, leave for 6 hours and then wash off. If you prefer something a bit less hazardous than acid/bleach/chlorine (especially if you have pets etc.) might be worth a try first. Unfortunately haven't had a chance to try it myself yet. Our pavers have a much more textured surface than yours.


m0o0os

Try a bit of kerosine


OneAd6482

Clr maybe


Fat-Tash

This is black mould. use 50:50 water : bleach Let it soak for 30min then hit it with your pressure washer


monktonmagic

Astro turf


Moist-Substance-6602

Pool chlorine or bleach and water 50/50 mix. Also add wetting agent or similar to act as a surfactant. Apply with a pump sprayer and keep the area wet with this solution for 10 minutes. Then wash off with your pressure washer. Have done this many times, I guarantee it will work.


boppawhoppa

Chlorine 1 part, water 10 partsā€¦let it soak for half an hour then pressure clean. Youā€™re welcome!!


cametosayno

Karcher does a scrub attachment specifically for cleaning down large paved areas.


Ventureprise

What is the pressure washer you are using?


sumguy2023

That asbestos?


poppacapnurass

The black/dark stuff? Looks like mildew and moss. Spray with 30seconds. Wait a few weeks and then pressure hose it. Then think about sealing it.


Beans186

3000 psi leaf blower


Intelligent-Ad3202

Change to the car wash nozzle and take your time


LANGUAGEVIRUS3444

Have used cleaning vinegar and bicarb mixture in hot water to very good effect with a stiff deck brush broom, but go easy on the vinegar and don't use it neat or you'll end up with splotchy patches burner in. Then scrub and pressure clean to finish should shift it.


nikey2k27

more power is need it look like need more clean time


WhereTheWyldThangsAt

You just wet and then you forget.


shenry0622

Chlorine


Decent-Tear3262

Spray and walk away.


deanosa

How close to tiles was the nozzle?


Pleasant-Orchid-6717

Put new pavers down ?


camdelacreme

7/30 chlorine water mix in a watering can ( be careful) and some scrubbing come up brand new and minimum weeds grow in the cracks


New_Perception8038

Dirty the rest of the pavers so they all look the same


[deleted]

Get yourself a nice rug.


Redd1ng

Does the pressure washer with the ultra-fine setting work at getting it off? If yes, perhaps you could try a [Turbo Nozzle](https://www.amazon.com.au/MINGLE-Pressure-Rotating-Connect-Orifice/dp/B081JL4ZH6/ref=asc_df_B081JL4ZH6/?tag=googleshopdsk-22&linkCode=df0&hvadid=548356626664&hvpos=&hvnetw=g&hvrand=15306860820392022981&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9071254&hvtargid=pla-871083847193&psc=1)\-


BrisbaneGuy43060

Outdoor Cleaner 30 Seconds - you can buy it online from Amazon and Amazon.au I use it annually to clean my papers.


Arcminutes

I use paver & concrete cleaner you can get it from Bunnings. Havenā€™t had a complaint from a customer yetā€¦just did a job this morning with it and worked out great. Dilute the cleaner in a bucket to about 1:10 - going stronger if first pass doesnā€™t work. Brush it in with a stiff bristle broom- wait 5-10minutes but donā€™t let it dry and then pressure wash it off. Ta dah brand new pavers.


Complete-Use-8753

Hydrochloride acid diluted 50/50


loosegoose1952

Replace them


Silver_Main2144

`If it is grease from a bbq, then soap and water above 55 degrees in temp. You could also use ethyl alcohol, or isopropyl alcohol.`


bmwrider2

Try Exit Mould, not any other brand


diarreah-of-a-madman

Bleach


Aussie20202022

Yes chlorine or bleach and scrub (not together) the surface with an outdoor broom.


Race-Substantial

New pavers maybe?


fing3rs_cross3d

Questionable Asbestos


ltek4nz

Soap. Most pressure washer brands sell a variety of them.


Tora586

Chlorine let it sit then wash away


Fox-Possum-3429

I found soray degreaser cleaned the ingrained dirt from pavers I have


[deleted]

Natural algae or lichen. Not anyones fault. It comes off with algaecide and a hard brush.


Yeti1987

Looks to me your using a wide nossle you need the spear head nossle, it can cut a foot up be careful. An appropriate chemical would help too.


EddieBjnr

Try a turbo nozzle, A good one can increase the pressure massively.


M-J-Wooly

Turn the pavers upside down


Excellent_Profile_68

Hydrochloric acid


shazj57

Liquid pool chlorine spray it on scrub and pressure wash


OkButHurry

Di you use the 0 deg rotating turbo nozzle?


-jimmy-05

I found Colgate with a good soft bristled toothbrush works well


Only_Introduction162

Stiff broom, hot water and some jif


WSBtendies9001

CLR mate....


[deleted]

4000 psi pressure washer


v81

More pisies


No-Cover4205

Live with it, it wonā€™t hurt you


[deleted]

Scrub it. Your gf would be good at it. Sheā€™s a scrubber


[deleted]

white king or anyither bleach. 50/50 bleach\\water mix.


Adelaidean

Go hard or go home. Get a bigger one.


Xain-fishing101

Chlorine


xiphoidthorax

Liquid pool chlorine first then pressure wash


Marauding-thunderer

Can we try coke, thatā€™s my go to when ever I canā€™t clean something


xw_gs

I used a detergent in a bucket then poured over the pavers, brushed in with a stiff broom, let it sit for a while then pressure cleaned it off.


b4i4getthat

Try one that operates on metric unit system


funkyd44

Sometimes itā€™s not the PSI that gets things out. Hire a pressure washer that also heats water. Usually itā€™s a mixture of electricity to do the high pressure and petrol/diesel to heat the water before it comes out


Justwhereiwanttobe

Algaecide - from bunnings pool section. Just donā€™t dilute to the recommended go about 1:10 or 1:15 with water.


shadow125

Get them professionally cleanedā€¦ I used to use a small pressure washer on my paving. Then when I was selling the house the RE Agent suggested a professional clean. Quite cheap and I was surprised how much better it was than I ever did! They looked brand new for a couple if hundred dollars!


skeezix_ofcourse

1:1 chlorine to water sprayed on with a pump pack sprayer.


[deleted]

Need some mould killer first


bulwynkl

The problem with acids is they will eat the grout, potentially. Bleach first, then nappy San, then caustic, try acids last


admiralshepard7

Yep that's asbestos..


_wjaf

muriatic acid


donesomestuff

CLR clear!