I'll share my bad ultrasonic cleaner experience. Never, ever put anything in an ultrasonic cleaner that is made of anodized aluminum. The cleaner will partially remove the dye in the anodizing. Anodizing creates microscopic "hair follicles" that stand straight up from the base metal and provide a texture of vertical fibers to absorb and hold dye. That's why anodized parts can be dyed so many colors, including dark blue/black that approximates bluing on ferrous metal. My cleaner made a mottled mess of an aluminum receiver. It looks worse than when I started. Hoppes No. 9, a tooth brush and an air compressor blow dry would have done an adequate job, but I experimented. Ultrasonic is O.K. for small ferrous or copper based parts, but beware anodized aluminum like an S&W airweight frame.