Acetone is good stuff (plenty "hot"). It gets the job done for sure!I was going to probably clean the tank with acetone (after draining & removing from the truck).
Not a bad idea to remember it burns (and when it does you really can't even see flame).
An extinguisher nearby is not a bad idea. But what would ignite it, right?
In the best case, it'll never ignite on you.
And if it does and there's no extinguisher on stand-by?
Well, then you got a real good story for telling everybody!