MAAS is a polishing paste similar to Simichrome and Flitz. It's pretty good stuff and polishes metal really well. The only problem with those three in preparation to etching is that they all leave a protective coating on the blade. If you use MAAS, Flitz, Simichrome, et. al, make sure you clean off the blade with something like methanol, isopropyl alcohol, etc. to take off the protective coating left behind with these polishing pastes.
I've never had the opportunity to use an ultrasonic cleaner...sounds intriguing.
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