Every couple of weeks I mist my mat with the spray bottle when I shut down for the night and just let it soak until the next day. It's usually dry by the time I wake up in the morning, but if not it gets a quick wipe down with a towel. Mats definitely last longer with humidity. If you live in a humid climate you may not need to soak them as often, but the furnace and A/C will dry them out too so a little misting once in a while will help.