What is the best method and material for cleaning the chrome on the bumpers, emblems, mirrors, etc. that will shine them up, protect them and not harm them? also I just got my first classic, a '66 c-code coupe, and I was wondering about steam cleaning the engine while its still in the car, can i just cover up the carb and distributor and steam clean everything or will that harm stuff? It has a bunch of built up gunk all over the place and I'd like clean before i start working on it.