Look at the home made solutions at the link below for "Chemical Case Cleaning Solutions" and then look at the YouTube video.
I made the third solution of 1 quart of water, 1 cup white vinegar, 1/2 cup lemon juice, 1/4 cup laundry or dishwashing detergent, 1/8 cup salt for just washing my brass. And you can see in the Youtube video how much better the vinegar solution worked than the store bought Lyman case cleaner.
Homemade Firearm Cleaners & Lubricants
http://www.frfrogspad.com/homemade.htm
UltraSonic Case Cleaning
High-Tech Way to Clean Fired Cases INSIDE and Out
http://www.6mmbr.com/ultrasonic.html