Keep your brush and bucket near the door to remind you to clean as you leave the sauna.
Use towels in the sauna to prevent stains. You don’t necessarily want to wear one during the steam, but at least lay one down on the bench where you will be sitting. This will prevent too much sweat, dirt, and dead skin from getting into the wood, which is what causes stains. If stains are particularly difficult to get out, use a light sandpaper to sand down that part of the wood.
Be very careful not to use the pressure washer on the interior. The wood inside the sauna is softer, and the pressure washer can damage it.
If your sauna has a wooden door, the humidity may cause the door to swell. Keep an eye on the door’s hinges to make sure it opens and closes properly.