I've taken many door panels to the chemical stripper (like you would use for stripping paint and rust from sheetmetal). Works great. Chemical doesn't affect most plastic. Door panels, consoles, inner fender splash shields, etc. My only caution is that most chemical stripping places are used to working with metal so you will need to ask them to be more careful to not get knocked around.
Find a place that specializes in stripping furniture and they are more careful.

I've also had some stripped with soda-blasting.