Hi Guys
I Use PCB etching solution from Maplins electronics store in the UK. The way I do it is to wipe the solution on to the parts neat, rather than diluted with water, and then immedeately wipe it off. It works really quick on nickel but havnt tried it on chrome. All the metal parts on my guitar are the original gibson ones apart from the ABR1 bridge which came from a shop in London called Rokas on Denmark Street and only cost about £12.00 a couple of years ago. Any streaks left after application are buffed off with silver polish. This treatment works great on screws as well. A few photos are here.....
http://img66.imageshack.us/img66/646...otos011bw9.jpg
http://img91.imageshack.us/img91/984...otos009fe4.jpg
http://img221.imageshack.us/img221/5...otos010de1.jpg
It took a few applications but I think the results are worth the effort.
Rob