Originally Posted by
Circuits
The maker of my tank (Sharper Tek) warns that "mirror finishes on aluminum can be dulled" from cleaning in an ultrasonic tank, and recommend use of a "dispersion plate" they sell if you're going to be cleaning mirror-finished aluminum pieces. I don't believe the same applies to the hard-coat anodized surfaces of an AR upper and lower, but who knows?
I use simple green aircraft as my detergent, and haven't noticed any negative effects on the uppers or lowers I've cleaned in my tanks, but I haven't gone through a dozen cycles on any of the parts yet, as I only dunk the rifles if they're extra filthy (usually after MG rentals), otherwise I still just clean by hand. I've also done big batches of magazines in my tanks, using one for a simple green cleaning pass, then a quick dunk in light oil to displace the water and lubricate them before letting them drip drain and air dry.
I have several smaller tanks I use for BCG assemblies and other small parts - but those are steel, anyway. For large enough tanks, handguns can just be dropped in the basket with the slide locked open, or cylinder swung out. Single actions I disassemble and drop the frame and cylinder as two pieces.
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