While shower benches don't typically get moldy, it is possible for them to develop mold or mildew if they are not properly cleaned and maintained. Mold and mildew can form on any surface that is damp and warm, so it's important to keep your shower bench clean and dry. To prevent mold and mildew from forming, wipe down the bench after each use with a towel or sponge. You can also spray the bench with a diluted bleach solution or vinegar water solution to help kill any mold or mildew spores that may be present. Be sure to let the solution sit on the surface for a few minutes before wiping it off. If you do notice mold or mildew starting to form, you'll need to scrub the area with a stiff brush and soap until all of the fungus is removed.