What to clean gas tank with?

I have actually used sand with water, and it does the same thing (scrubs the inside with abrassive)
Muriatic acid is great for any rust, but won't touch the old fuel residue.

70DartMike said

I'm not cheating out on a tank, the tank is good, I just didn't drain the gas soon enough and now I want to get use out of it.

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