I have a bluish stain on cushions but not from a tarp. The second time it appeared I realized it was from the bottom of a new dark-bottomed hyperlite a guest rider leaned up against the seat. There was some kind of residue or pigment on the bottom of his new board even after it was used a few times that transferred to the vinyl. I worked it with soap and magic eraser which got most but not all of it. It has mostly faded out since then. Watch out for new boards on your cushions!
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