I'll post again what works for me, add 2 - 3 tablespoons Citric Acid to 1 quart hot water, add brass, stir, in just a couple of minutes remove and rinse 3X with clean water, dry. Reuse solution if needed. Citric Acid is used in food processing and actually strengthens brass. Available at many local stores or on- line for less then $ 3.00 per pound (bulk). Google Search "brass cleaning - citric acid".
Excellent. I have used this method for about three months and it cleans very well. I use a smaller amount, two (2) teaspons rather than tablespoons. The brass including primer pocket is clean not polished. Home brewing stores or the canning section of grocery stores sell a small quantity so you can try it before buying a large quantity. An old crock pot is helpful.