I've used Lemi-Shine and Dawn in a rolling tumbler not vibratory.

Dawn and lemishine work.  I am using Frankford Arsenal cleaner now, works well if you mix it 40:1.  I miss the old Cabelas green liquid cleaner.  It worked great!

Crushed walnut shells with a couple tablespoons of Brasso.

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Schuetzendave wrote on Oct 12^th, 2023 at 9:08am:



so I thought the Brasso seemed high, from an American Amazon account 
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I don't know the conversion rate, but the Canadian price stinks

Sorry to go off topic- I may need to delete this later 

Thumblers tumbler with ceramic or SS pins. Dawn dishwashing liquid and a dash of lemon juice. Been using it for years with great results. The lemon juice increases the shine of the brass and it is inexpensive.

When I used wet ceramic cleaning, I used dishwasher detergent and lemi-shine.  It worked well, but I found it belled the mouth of the case in slightly, and since I slip fit bullets without sizing, that became irritating, so I went back to walnut hull with red rouge after using lemi-shine and detergent in the ultrasonic.  The cases come out shinier, and don't tarnish as quickly because the rouge leaves a bit of wax on the brass.  

Ceramic for me left the brass very clean but slightly dull, and it tarnished very quickly from being totally clean. 

The scientific study you supplied indicated copper alloys including brass can exhibit cracking after soaking in a liquid concentration of:

1. mercury
2. mercury and ammonia

Brasso only has a very small amount of ammonia (seventh item based on percentage of weight - 5 grams/liter) and has absolutely no mercury.

And we are not completely immersing our cases in liquid mercury or a solution of mercury and ammonia.

We only add a small amount of Brasso that has an even smaller amount of ammonia in it that assists the walnut to provide a brighter shine.
We are not soaking cases in liquid Brasso.

The study you provided does not show  corrosion from pure ammonia - only from a concentration of mercury and ammonia.

Also ammonia will not corrode brass unless water (or mercury) is also present.
And no I do not add water to my Brasso when I put it into a tumbler to polish my cases.

"The electrochemical reactions of brass in ammonia environment are as follows: Copper free AQUEOS ammonia (containing water) is oxygen reduction and primary oxidation reaction is oxidation of copper to form cuprous complex ions. The formation of cupric complex ions leads to stress corrosion cracking of brass in ammonia SOLUTIONS".

Do you think a Company would make a brass polishing compound that corrodes (oxidizes) brass?