Cleaning brass on the cheap:
Get a small ball peen or tinker's hammer, Lee universal decapping pin ($5 at most places), and a shell holder for the case in question.
Place the shell holder on a steel plate, anvil, or similar, and gently tap out the primers. Many little taps - smacking hard will only destroy the pin.
Select a cotter (split) pin that the sharp end just fits in the primer pocket. Wrap hockey, electrical tape or similar around the head to form a handle.
Scrape the crusties out of the primer pocket with the cotter pin. Just the worst of it. Usually, just a quick spin will do.
Dump the cases into a medium/largish pickle (or whatever) jar to about 3/4 full. Add a tablespoon of Lemishine (citric acid) and a dollop of Dawn detergent.
Add cold water to about 7/8 full (brass submerged but a good air pocket). Tighten on the lid and give it a good swirl to mix it up. Leave it for a day or two.
Drain and rinse the brass several times in cold to luke cool water (heat will retarnish the brass). Blast with shop air or spread out to dry.
Beware of heat. If you mess up, you could soften the case head which will risk a catastrophic rupture. No heat guns, toaster ovens, woodstove tops, etc.
If you have an old dessicator (for fruits, mushrooms, berries etc), that would be perfect. Just get your wife's permission first.