That's some work. I once did a Jeep gas tank. I used hot Pinesol (wood floor cleaner) to dissolve the gunk. But it revealed pin holes in the bottom of the tank. As the tank was dented from the Jeep being back into a stump or similar I opted to cut open the tank, reshape and patch in new metal. Still near boiling PineSol worked really, really well. I used it on a carburetor as well.
Matt
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