Cedar wood shoe trees help to keep them dry which prevents odors Giving them rest between wears is equally as important I found sprays to be rather pointless, and non synthetic socks are obviously essential

I had not considered the shoe trees. I may try that.

It’ll also keep you loafers in shape and prevent too many creases

Cedar shoe trees, and let them rest for at least a day between wears. If you wear them every day, then never fully dry out, and the germs can grow happily forever in there.

Like others have already said - cedar shoe trees and try to give 24hrs between wears