I think you will be happy with the electrolysis method. A slow process, might take several rinsings and cleaning/replacing of the steel rods (I used threaded rod) but good results in the end, and it doesn't weaken the tank or attack paint. Do a google search on "electrolysis motorcycle gas tank" and a bunch of stuff will pop up.
I use an impact driver after screws have soaked. Worth its weight in gold!
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