Flat Four-
WD-40 will evaporate and leave almost no residue,
and will be gone after the next rain. try a thin film of
wheel bearing grease on the hubcaps and headlight
trim rings. centrifugal motion will spin any extra material
out thru those two little drain holes , but enough will
remain to keep them lubricated. POR-15 might be less
messy here.
CLR will remove rust stains in the turn signal lenses.
dave\X/