My brass goes into the pocket of my sweatshirt. By the time I get home, the brass is clean and the inside of my pocket is dirty. But since I can't see it, it doesn't count.
It doesn't get any cheaper than that.
Contrary to popular belief, brass does not need to be cleaned of firing residue before resizing. If it drops into the mud, you should wash the mud off, but that is all.
When vibratory cleaners came on the market, guys had to think of reasons to use them. We didn't have them for many years and never missed them.
Just an ordinary vibrating tumbler with corn cob media does the trick quite nicley, this is the one I use 43930 - Frankford Arsenal Quick-N-Ez Case Tumbler and 110 Volt Separator Master Kit and it does a wonderfull job plus it comes with everything you need to get started all you need to do is add your decapped brass. Remove a few hours later and you have nicley cleaned brass.
I personally would not use wd40 on mine, just a trace amount of wd will kill a primer.