Using a heavy rotation of towels on both the bench and the floor will keep your sauna clean. Do not sweat directly on the wood. You can clean your sauna with a damp cloth after use. If you want to use a small solution of hydrogen peroxide (1 part hydrogen peroxide to 9 parts water) you can. If you really want to clean your sauna to where it looks brand new, you can always sand the wood to get rid of any sweat stains. My biggest recommendation is always to put a towel on the bench and on the floor to avoid sweat stains. The more proactive you are in keeping your sauna clean from the beginning, the better.