I use a mix of 1 can fuel system cleaner (STP) and equal amount of Varsol. Put a handful of junk nuts and bolts and give the tank a darn good shake. You get all the crap out and nice clean fasteners to boot. Use the fluid remnants as fire starter.
I just cleaned a 1968 alpine tank the fuel was in the tank for so long it had a tar like coating inside the tank.I used a can of carb cleaner and it broke down the left over fuel and cleaned it right up my dad and I were amazed.
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