A small, stiff-bristled nylon brush and some QD spray (or APC...or ONR...any decent lubricating liquid). Go slowly around each piece of trim, all the while chastising yourself (or your customer) for creating all the effort. I confess to keeping a bottle of Wax Blaster on hand too. Seems like nearly every car I detail has wax residue somewhere. This stuff works quickly and well. And then, as suggested, by huge quantities of painter's tape when it's on sale.