STOP! First off all do not spray any thing directly to horn as it could get in or on driver. If using a spray wax spray to micro fiber fiber cloth then buff with a dry micro fiber cloth.Find out what kind of automotive paint they are painted with Most likely they are painted with base coat clear coat so use a wax appropriate wax for clear coat I like to use a spray wax called ICE you can get in any automotive store or at the marts. Since you are not driving these down the road I wouldn't worry to much about dirt build up but if it looks like it is embedded with dirt use a cleaner wax for clear coat if it is painted with clear coat.This requires a little elbow grease as a cleaner wax works out the haze and dirt by buffing the wax in with the applicator pad in a circular motion lifting the dirt out (note make sure the applicator pad is damp or pre moisten working wax on pad first by hand never put a dry abrasive object on a high gloss finish) I would prefer to do them with the spray wax simple great results.
