Brought that nasty $20 pos aluminum coke tank that that crazy old man was fermenting wine in after I unsrewed the valve and kept putting paint thinner and rocks in and shaking. Then put hot baking soda water and rocks in and shook it around.
Then put the valve assembly in a bucket of paint thinner to get rid of all the old form-a-gasket.
Looked good as new inside except for a couple small spots of dried up wine clumps.
Took it in to the welding supply today and exchanged it for a full aluminum tank for $12 cash.