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How to clean out heavily varnished tank?

Posted: Sat Feb 18, 2023 9:53 pm
by Aircobra
Internet is full of advice on this for car tanks, but i think they're different tech with zinc pated thin steel
noticed someone on this forum is suggesting kerosense and caustic soda. is that the same as drano drain cleaner?
Its just that sticky, foul smelling residue of 2 stroke