ChemistShooter, what's your thoughts on using regular Simple Green in ultrasonic cleaning? I heard that the regular Simple Green can "attack" aluminum. I purchased some Simple Green Extreme, bluish bottle & aircraft safe. It is supposedly safe for all metals, polymers, & plastic. Home Depot, Walmart, & Amazon sell the Simple Green Extreme for about $15-$17/ gallon. It doesn't look like Lowe's carries it.
EDIT: Wow, I just checked prices, and they have basically doubled from when I purchased some towards the beginning of last year. Amazon= $35/ gal. Jet.com & Uline.com have it for about $22-$25 / gallon though.