Years ago I cleaned my door panel's with a scotch bright pad, then wiped down with acetone. I sprayed them with Rustoleum primer then sprayed with Rustoleum satin black and they have held up very well. Surprised.
In the fall I wiped down the exterior and door panels that were looking tired with wd40 and it made a huge difference. We'll see how long it lasts. Even if I do it twice a year it doesn't take long to do.
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