I'm pretty sure most IC manufacturers do not "validate" their product is ultrasonic compatible.
I wouldn't risk aging components against the vibration of a ultrasonic transducer unless it provides real value.
As others have stated; some soap, water followed by a toothbrush does wonders. Use IPA to displace the water if you want to speed it up.

I did this to a cruddy Original Bally Sound board and it came out looking great.
Left it in my garage for a week in the "texas heat" while I was visiting family at the middle of Dec. looks great.