EWIS anyone ?

I have also found a product that cleans up copper and brass really well, and needs to be neutralized with hot water. Its called alumiprep 33 made by henkel. I recommend this for cleaning up switches. I carefully uncrimped my heater fan switch, hazard flasher switch, undrilled the rivets on my headlamp switch and put the pieces in this stuff. A little steel wire brush action on the brass contacts, its as good as new, rinse well, blow dry, then reassemble with some dielectric grease. The headlight switch i used machine screws and nuts to replace the rivets. My hazard flasher switch would not even move before i took it apart to restore it. Dont forget to use your ohmmeter to check the contacts to make sure its all working internally.