WD40 and a set of these brushes and elbow grease. All these carbs are aluminum but some Eddy's had a "Ball Burnished" finish that when new shined like chrome. Simply polished aluminum. These brushes can be found at home depot paint dept. They can reach the tight spots but for 4 carbs get at least 6 sets of brushes. They wear out quick. $4 a set I believe. A Hoppes pistol cleaning rod w/ .45 cal, .38 cal and .223 brushes also come in handy for the passages, and Hoppes powder solvent will break out any gum/bs and smell good too!