Hi again, when we bought our boat last year we knew the clear vinyl on the canvas etc was dirty but thought with some elbow grease we could get it clean. We've tried windex, 409, soft scrub, a warm water /Dawn bath overnight, powerwashing, brush scrubbing with a number of cleaners, soaking in 100 deg water in the hot tub, but NOTHING will loosen up the grunge you see in the pic. Any ideas short of replacing the canvas? Thanks, Tom.
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