I don't think you need a new tank. Clean it out well and go.  What kind of stripper did you get?  I'm thinking clean it out with the gas you drained. In with the gas, agitate and repeat. I would imaging she didn't pour the stripper in the hole.  Do you need to clean it up, yeah Probably. Do you need a new tank, nope. Do you have a cool chick that will get her hands dirty...yep. That's a win.

Thank you all very much for the advice.

BTW, be careful handling acetone and all the volatile solvents like xylene, toluene etc. Wear nitrile gloves, don't breathe fumes.

I have used acetone for many years as a fuel additive, multi purpose cleaner, you name it. Great, useful stuff.

I was always careless about getting it on my hands and clothing. What's to worry, it evaporates so fast and completely? Then 5 years ago I contracted lymphoma, a killer blood cancer. After hellish treatments the docs beat it back and I live on. But I learned that the only clear statistical correlation as far as a cause is occupational exposure to volatile solvents and certain pesticides. They apparently have their wonderful solvent effect on DNA strands as well, and human skin and lung tissue are a transparent barrier to the light, hot molecule -- it goes right thru the skin and lung tissue into the bloodstream.

So, use it, but don't get any on ya and don't breathe it. 'Cause lymphoma sucks, and scares the bejesus out of you even if it doesn't kill you, and is blindingly expensive and unpleasant to treat.

Just a heads up to whom it may concern.

In fairness to acetone, because of part time home repair and landscape maintenance work I did for a lot of years, I had exposure to a wide range of solvents and pesticides. Like with a lot of cancers, the MDs couldn't  point a direct finger at any one cause. But I was plenty careless with acetone until I suddenly had to rethink my drink about this kind of thing.

I had a step brother who was an Army tech sergeant in Vietnam, loading Agent Orange. He died 15 years ago from the same kind of lymphoma that hit me. My only point being, there are a lot of unknown effects of chemicals we use that can take a long time for the fuse to burn down and finally undo us. So caution is advised.

I clean my engine with Bike Bright.  Spray it on, use a small paint brush or scrub brush to get where you can't reach easily.  Then rinse it off and then wash it again with a good car wash soap.

While we were talking about solvents "not" to use, I recalled that when I was a kid my dad knew a fellow in Warren, Ohio that restored Indian Motorcycles (Gambaccini).  They used Carbon Tetrachloride in their parts washer, and over time the solvent caused him to have liver problems.

The really scary thing I learned was about the Disc Brake Clean....and why some of them now say "Chlorine Free".

If you spray the old Disc Brake Clean on a hot surface, the rising fumes can be altered into "Chlorine Gas" and it can kill you!