When I first got my greenhouse, I read a long list of chemicals that were never supposed to touch it. I think over the past few years I have tried them all in small spots, and never noticed any damage. I made the mistake of using diluted latex paint as shade paint the first summer, but then could not get it to wash off, even with a pressure washer, so I had to remove my top layer of plastic. I have since recycled it into patches for holes and end walls of other structures.
I normally don't clean mine on the inside, and it's been up for six years now. I really don't need maximum light transmission, anyway, as I quickly get too hot in full sun, anyway.
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