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I hate that residue on black plastic too. I have used lacquer thinner then follow up with one of the oil based clear protectants with success. Paint thinner should work too. May need to use a toothbrush to clean out the low spots in the plastic. Turtle wax is the best. Nothing is better for chrome and polished aluminum - just keep it off the flat black plastic and rubber!

 

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Yes lacquer thinner will melt styrene plastic but it won't bother the polyethelene and urethanes on car exteriors. Also If the surface is painted, the lacquer thinner will attack it but all of the modern black exterior plastic is self colored so the hot stuff won't bother it. Go ahead and use paint thinner on your cleaning job and be double safe. Also can use bug and tar remover from auto parts store but all it is is paint thinner that costs 10x as much.

Glad to hear the mold isn't coming back. Still needs paint job to seal it though.