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I used Ethanol (E85) to clean out the varnish and sludge, with nuts inside and shook every once in a while for a couple of days, then white vinegar to remove the rust, I think I left that in overnight. Make sure to rinse out with water good. When I did mine I immediately coated the inside with 2 cycle oil to keep it from flash rusting.

Thanks for the replies guys. Much appreciated

Pemdoc65, how long did it take to clean the tank using the cider? I heard it could take days. I also heard that you need to neutralize the tank immediately after to avoid-flash rust. Baking soda and water should do the trick.

Thanks oldstan. I bought some vinegar today and am testing the fuel cap to see how it works. It seems the electrolysis freed up some loose rust and now I have pin holes in the tank bottom. I'm trying to find a welder to spot weld the pin holes but no one wants to touch it due to fear that it will open a can of worms. My last resort is jb weld or a new tank I guess.

I left the vinegar in the tank for three days, shaking it a couple times a day. I rinsed it with copious amounts of water and coated with WD40 right after that. I did it a month ago and no rust yet.