I have a gunsmith friend that swears Simple Green etches steel. I do not know what concentration he used, however. He placed a long, blued part (magazine tube) partially in and partially out of the Simple Green solution in his ultrasonic tank. It left a permanent ring in the finish at the surface level.
I use Dawn and water myself in my tank and it doesn't seem to do visible harm.
Per an earlier thread here, I don't put loaded springs in the tank.
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