Re: How To Remove Varnish From Gas Tank?
Good advice so far. The trick is agitation...the endless shake, shake, shake. Takes patience but it works. After you get it clean, take it to the car wash or use a pressure washer to clean/rinse it out. Rinse with clean water several times, let it almost air dry completely then pour a bottle of 93% octane rubbing alcohol in there to evaporate out the remaining moisture. Now you're all set to re-use it. There are gas tank sealers/liners out there that will put a new skin on the inside of the tank if you think rust may be a problem. Google them up, I like the ones rated for aircraft use...they are resistant to alcohol-added fuels, like the ethanol blended gas we get nowadays.