I finally decided to make by brass mini-mortars all nice and shiny again. I saw a tip in the black powder gun section about a household cleaner calllled "KABOOM shower, tub and tile cleaner". It comes in a spray bottle. They make another variation of this stuff that says for something else... it is the "shower, tub and tile cleaner" that they specifically refered to.
Anyway, I found the stuff in the cleaning stuff section of the local supermarket. It really works... just spray it on, wait three minutes, rub off with a damp paper towel, and then rinse with water. I had to repeat the process about three times to remove almost a years worth of discoloration due to BP induced tarnishing.
changing subjects just a bit...
I also found that coating the bore with "Ballistol", letting it sit overnight and wiping it down with a paper towel really removes BP residue that had resisted cleaning with just soap and water. I'm starting to love this Ballistol stuff... I seem to be using it on everything gun related all of a sudden (including stocks and holsters). Another plus is that it has a funny, but non-offensive odor. If you have ever been evicted from the house for using Hoppes number 9 or something like it, you know what I mean about offensive odors.
Rick