Was dead set against ultrasonic cleaners until last month

I always thought ultrasonic cleaners were overpriced gadgets that couldn't do much a toothbrush and some solvent couldn't handle. Then I picked up a dirty Canon AE-1 shutter assembly that had years of gunk baked into the blades. After 10 minutes in a borrowed cleaner at a shop in Portland, the blades moved like new. Has anyone else had a specific part that changed their mind on these things?

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