Waxed car and now black plastic peice under rear bumber
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Dishwashing soap or alcohol should take the wax right off. You can then use a protectant like Aerospace 303 to protect the surface and give it a rich color.
Most detailers frown on using ArmorAll as it damages the surface over time and leaves a greasy, high shine residue.
Unfortunately, the OP may have damaged his bumper already by using polish. He can try a product made specifically for restoring the black color such as "back to black" found in most auto parts stores.

Dishwashing soap or alcohol should take the wax right off. You can then use a protectant like Aerospace 303 to protect the surface and give it a rich color.
Most detailers frown on using ArmorAll as it damages the surface over time and leaves a greasy, high shine residue.
Unfortunately, the OP may have damaged his bumper already by using polish. He can try a product made specifically for restoring the black color such as "back to black" found in most auto parts stores.
Its was on there for a month before i decided to clean it.
i used Meguiar's Gold class trim detailer.
The wax came right off. Worked really well.




