Interior Restoration Help-Please

If I remeber correctly the e-body door panels are molded plastic with a texture on them that would scrub off , especially around the handles where jewelry rubbed it. If this is correct to your car then any hard bristle brush is a bad plan.
I have used thinner and rags to lift the paint off of vynil several times without doing any harm. Most recent was early A steel seat backs covered in vynil. I use Wesleys bleach-white in a soak tank to strip plastics.