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Lots of varnish deposits in Plastic gas tank- Any ideas?


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I just purchased a used 24 gallon plastic gas tank for my boat. In the corners of the bottom of the tank are some heavy varnish deposits from years of storing bad gas. I've tried to "pry" off the varnish (which has the consistency of tar/gum) but there is still quite a bit of it left. Remarkably, it is very tacky and does not want to come off. Will any of your products work to remove this varnish from a plastic tank?

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