I've tried all kinds of chemicals to do this. Even heavy duty automotive strippers, the kind that will remove thick paint off a car in seconds, would not remove any anodizing off, even left overnight.

I couldn't find that greased lightning stuff anyhwere so i couldnt give it a try.

Oven cleaner does work though. Problem is, if you leave it on too long it leaves a nasty hard residue all over that you have to sand off, but if you don't leave it long enough, it doesnt get all the anodizing.

and after you are done, be prepared to do some light sanding and polishing. Mag polish works quite nice.