I think there used to be a paint stripper called "Carbolift", with mixed reviews. But I tried to get some a few years ago and struck out. Now the company seems to be defunct.

Here is the MSDS, but it is very uninformative.
https://powder365.com/wp-content/upl...olift_MSDS.pdf

It does seem to have some hydrogen peroxide in it.

Anyway, if you're not wanting to preserve the paint, I'd probably go with sanding. If you were lucky, there would be a heavy clearcoat over the factory paint, and you could gently sand through the top coat into the clearcoat without destroying the factory paint.

However, 20 years old, it is quite possible it was repainted because the original paint was damaged.

Could poor original paint be causing adhesion issues with the new paint?