I have told customers of mine to use a couple of different household cleaners to clean their hot tub with when they drain it. I have told customers to use windex, 409 and any kitchen surface cleaner. Lysol makes a good anti-bacterial kitchen cleanser. I always made sure to tell them to rinse it extremely well before filling it back up with water in case it started foaming.
Is there any other cleaners that you guys recommend or not recommend people to use when wiping down their spas?