How to clean inside of gas tank?

guys, i dropped the gas tank outta my 65 valiant that has been sitting for a long time. the gas has spoiled and smells like acetone. after i got the tank out and had a look inside it is covered in surface rust and a black texture that looks like mold. its hard to explain but the gas that came out was red with rust. can this tank be cleaned up and reused? or should i cut my losses and buy a new tank?