Quoted from Yelobird:Berry’s. Using mine 20 years with no issue. At least a dozen forum threads on tumblers and media.
https://www.berrysmfg.com/category/brass-cleaning
Next year I'll be celebrating 20 years with mine. Motor went out in the first year or so but was covered under warranty. Replaced the lid twice due to heavy use. I've probably cleaned just as much brass as I have pinball parts over the years.