Use muratic acid, Just empty the tank then poor some in there and fill it with water. After about an hour or two dump it all out and wash the tank with hot water, but you will have to get gas back in it or put a little oil in it to coat the metal because it will flash rust, badly, if you don't. I have found this to be the most effective and fastest way to get rid of thick varnish. It really works fast. Good Luck
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