gotcha. i've looked into ultrasonic baths before, and that's always been a question is fitting a larger cassette. my largest is only a 42t. they make ones that are large enough, but they get expensive quick, then add in the extra cleaner you'd need to fill it.Correct; ultrasonic bath. It’s great, all the small things can just get chucked in but I do mostly use it for chains. Re: Cassettes, it probably wouldn’t fit a 50t, but like a 32 would fit I think. However since I use wax on my chain though, my cassette stays so much cleaner it doesn’t really need this. I simply use a large hard brush (like a huge nail brush) with a little degreaser on to clean any dry mud splatter off my cassette these days.
You can buy ones big enough for a cassette but the price ramps up with size.