I, too, use Meguires Ultimate Black ......works like a charm on my CRV which has black plastic (?) trim around the bottom of the whole car including bumpers. Lasts about a month before it loses its rich luster. I’ve used it on the Crossfire shroud too, but lasts much longer- probably due to being garaged.

no luck yet on previous suggestions about getting wiper arms off........WD40, rubber hammer, persistence, quality swearing, If my experienced fix-it buddy can’t separate it today, I’ll send away for the removal tool you suggested.