That black pebbly plastic is a real pain to clean. Two things that worked for me:
1) Time, and heat, it seems after a few weeks the Arizona sun won again.
2) 303 Protectant, this stuff is great, it is for all plastics everywhere, it is a UV screening product. This seemed to soak into the plastic and remove the wax. Also great for vinyl tonneaus and everything on your L...
By the way I tried lighter fluid and an ultrasonic toothbrush, not much help.
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