You can clean the bearing in any solvent or using plain alcohol, alcohol is what I use to clean my bearings in a shallow dish.
I also use canned solvent or de-greaser.
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So I don't need an ultrasonic cleaner?
No!!!
Though they are quite handy on some occasions it is a purchase that is required.
You can use a splashing motion or fill a Spray bottle and get the bearing clean.
I 3D Print Fidget Spinners for Halloween every year and use roller skate bearings.
These bearings are packed with grease and fidgets spin faster with no grease.