I need to refinish some hard plastic trim pieces from inside my car, but its as if the plastic is breaking down and has become tacky (if I touch it my finger print gets left behind, and my thumb has black on it). I've tried sanding it, but it seems to be neverending, I've gone through several sheets. I've tried washing it with alcohol and with an "orange" hand cleaner/degreaser, but no change (tons of blackness is left on the rag). Its still very tacky. I don't think I should try painting it until I get all this crud cleaned off. What else should I try? Would Goof-Off help, or make it worse? I've heard that acetone will break down plastic, so I haven't tried that.
Professional suggestions appreciated.
Plastic degenerates over time. Acid and alcohol baths will only accelerate this process. You need alkaline products such as soap and water - use this with a soft bristle brush. Do not scrub it too hard or sand it again as this will make it worse. Give it a coat of WATCO Danish Oil Finish and see how it cleans up.
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