Hi all. I don't use my hot tub much, but when I opened it to drain/refill today, I found some black spots on my pillows. Some as big as a dime, and lots of small specks. Also a few in the creases between colors. I have a 2007 Caldera Niagra. The pillows in the back were especially bad, because I open the cover halfway a lot.
I have tried dish soap, scrubbing bubbles, windex, & magic eraser....no luck. They lightened up a little and shrunk a little, but not much.
Any suggestions?