Ultrasonic Cleaner Solution

Whats are good choices in Ultrasonic Cleaner solutions and temperatures for aluminum? Same for treated steels?

I have been using Dawn dishwashing liquid water and ammonia at about 90 deg.

Thanks

I've had good luck with Totally Awesome multipurpose cleaner. Works great in steam-cleaner for carpeting. Great on grime underneath auto-bumper. Dilute according to instructions, 1:10 or some such.

Whatever you do, DO NOT use Simple Green on aluminium! It will dissolve it!!! Also damages steel too, discovered over 20-yrs ago by cyclists who soaked their chains in it for cleaning. Forbidden by military for aircraft. At least one Apache helicopter's crash was directly cause by stuff, resulting in it being banned.