Ammonia..........strange, I have been using ammonia for years and never had a problem. I have some plastic coffee cans
that I use. I place a paper towel, folded so that it fits, and another plastic lid that I place over the paper towel. Pour the
ammon the towel, follow that with the smaller plastic lid. You don't want the parts to be in touch with the ammonia. I
usually leave it overnight and it comes out kind of green. I then rub the parts with 0000 steel wool, this just shines the piece,
but, don't rub it that hard that it will remove all of the tarnish...........Don