Ultrasonic record cleaning?


I am curious to know if this approach to record cleaning would work? Are thier any wrong freqencies to watch out for?
buying a dirty used record from a resale shop would be worth while if it turned out to be cleanable. Brushes and cleaner are good to maintain a record or minimal fingerprints but that deep down played in dirt has been impossible for me to remove without damaging the record.
Please let me know if it will or won't and why,Thanks
audiobob
Seems like Bent Audio had an ultra-sonic cleaner a few years back. You could ask them?
I think I read somewhere that John Chapman hadn't the time to pursue it further and turned over development to Bob Benn at Sound Engineering