[Spridgets] Cleaning fuel tank

[Lee Fox]

Dropped the gas tank on my midget to install a new fuel gauge sender.
The tank is in surprisingly good shape, but has some gum and varnish.

What's the best and easiest way to clean the crap out and it it back together?

If it makes a difference, this is on a 1979 with vapor recovery and screen sock on the pickup tube.

Thanks.

Lee

PS: I'll do the Eastwood sealer routine when it gets warmer. Just trying for a quick clean.