I’ve personally never done this. Some sprays with degreaser and a rag is good enough for me and easy to do with the chain off. Talking apart the derailleur to get the jockey wheels and dealing with the bearings is I think too much effort for too little reward. Just my view.
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I definitely wouldn’t put the bearings in the cleaner. If you are going to disassemble things the jockey wheels would be fine, but also can be cleaned other ways as others have mentioned.
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