Bearing cleaning with ultrasonics

[Lido (Jordan)]

This method actually worked well for me and didn’t require much acetone (and would obviously work just as well with alcohol or whatever other cleaner):

Potentially free alternative to an ultrasonic cleaner for bearings?

We were about to throw away one of our kids disposable electric toothbrushes a few months ago and I decided to save it. Even though it might not actually be “ultrasonic,” it might work similarly to an ultrasonic cleaner if attached to a small enough bottle of acetone. Last night I finally got around to trying it. I don’t normally clean bearings if I have spares around, but sometimes you get a new one that’s supposed to be good but just isn’t spinning long enough (pictured here is a “DS” from a r…