Any auto parts store should have it, it will be in the paint section. Not sure why its called aircraft remover kind of a misleading name., its just a paint stripper with an airplane on the can.
I'd just have it shot blasted. Glass beads would work but if you want it to remain smooth I'd used a soda blast. It will take a little longer to soda blast it but it will be alot smoother.
Just remember to tape off the combustion chamber part.