Yeah LT, the thought of ammonia does get some folks panties in a wad, don't it!
For those who may be confused about ammonia, it IS harmful to brass IF, and only if, it's in contact in it's liquid state. Ammonia is added to a few polishes as a cleaning agent, it really takes off a lot of surface "dirt", but it's not part of the polish, as such, nor is a polish with ammonia a death sentence to brass if used properly.
Like any other liquid, ammonia evaporates. Pretty quickly in fact. When it has evaported it's gone, none is left, nada. SO we can add any polish we wish to our tumbler media, including the dreaded Brasso or others with the ammonia smell. Let it run it few hours to mix it well, then allow it to sit over night so the liquid ammonia can evaporate. If the urine smell is gone it's quite safe to use.
On the other hand, metal polish is metal polish, it all works the same, there is no magic in ANY brand. Get something from Dillion at high cost if you feel more comfortable with that or get some cheap auto polish at Walmart. Add a capfull from time to time and all will be well in shiney brass land. Seems most folks use far more than is needed.
Add two-three 3" squares of loose weave paper, facal tissue, towels or dryer sheet, in each load. All will work to trap loose particles of fine stuff and help reduce dust.
Adding an ounce or so of mineral spirits to each load will clean the metal surface very well and it also helps hold down dusting. Mineral spirits will also evaporate pretty fast so it has to be re-added when you want it to work.
Thanks for your service LT, and for all those around you too. Keep your heads down and come home safe, you are in our prayers each day.