Quote:
Originally Posted by SuperNovaSS
24 hours should be ok. You can also water it down if you are concerned. If it is varnish and not much rust, you may want to start with gasoline, lacquer thinner, or other solvent. Then you don’t have to worry about the time. Vinegar is an acid. You can handle this by yourself.
Jason
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I believe radiator shops used sulfuric acid when cleaning out fuel tanks. Eastwood sold a kit for cleaning and sealing gas tanks, check them out.