manually cleaning the inside of a gas tank on 1990 Subaru Justy

Hello,
I drained the gas tank of an '86 Subaru Brat that has been sitting for years and old,thick,dirty,sludgy gas(?) came out. I removed it from the car and want to clean the inside real good before putting it back on. Wondering if there is a solution of some kind that I can use. Any thoughts? Thanks for any advice or tips.

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