I’ve acquired an Isonic Model 4821 ultrasonic cleaner for pistols - any advice on which dish detergent gives the better results? The cleaner has a default setting of 140 degrees, a degas button, and a 30-minute timer you can set in 5-minute intervals. The tank holds 2.6 quarts - I’m guessing a teaspoon or a tablespoon per quart is the ticket, with the timer at 15 minutes.
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I always use Dawn. 
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Simple green is what I use. You want something that does not leave a residue. Lube does not stay on it if you have a residue left on it. Rinse in hot water.
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I add 1/4 teaspoon of Lemi Shine Original to both my Stainless Media tumbler w/ 1/2 table spoon of Dawn. How long I run the tumbler depends on how cruddy my brass is. I also add Lemi Shine to the rinse water. They come out very shiny with NO water spots.
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