Yes.. BUT DO NOT DO IT!!!!! (sorry for caps) you can but I wouldn't advise it mate! You can buy the soap already mixed in with it @ Wal-Mart for like $1.79 for a big chug of it. Ammonia is pretty harmless stuff you can splash it on you, inhale the fumes and be okay! But if you mix it in with bleach or anything in that nature you can be in for some SERIOUS problems.... NEVER MIX AMMONIA WITH ANYTHING UNLESS IT IS SOAP MIXED IN BY THE MANUFACTURE! (sorry for caps again) Sorry for all this but I know a guy who tried mixing ammonia in with some soap that had something in it and he ended up in the ICU for almost a week. Again Ammonia is sooo harmless until you start mixing it with stuff... But anyway IT WORKS WONDERS for two-piece buttons with brass or gold plating...
This is my first Confederate State Button of the year (2013) North Carolina found in a hut. You should have seen how this looked out of the ground, within 4 hours of cleaning it with ammonia this is what it came out with. Also look above on the last post you just posted and look at the Eagle C (since we were both typing @ the same time)