Clorox? Why? Why not use a dry wipe or if it's wet, wet with something that would help remove the oily residue, like mineral spirits or some sort of citrus degreasing product? I can't see that Chlorox would be any better than plain water which doesn't do much for oil or grease.

This is the way to do it. I just use dry rags as floss and use it to ratchet the cassette around.

But I'm tempted to try this. Why on the top shelf? I'm thinking maybe bottom would be better - maybe reduce the amount of crud dripping on the dishes below. Although I really don't care if my cassettes are all that clean. I only clean them when I have occasion to remove the rear wheel (see above).

By the way, I once washed a computer keyboard in the dishwasher, having read about it on the internet. It took a few days to work again - it needed to dry off. I did it with a very old keyboard I didn't actually need and doubt if I'll do it again. People thought I was nuts. Maybe so.