Originally Posted by
cny-bikeman
Is there some component of which I'm not aware that requires ultrasonic cleaning in order to perform it's function?
No, but if you have an ultrasonic cleaner, why not use it?
When you purchase an old bike of unknown history, I think it's a good idea to take it completely apart, and start over with familiar lubrication in known quantities. Generally, that means eliminating all the old greases/oils, and an ultrasonic cleaner is a very effective way of doing that, not the ONLY way, and possibly not even the best way. I'm not suggesting it for routine maintenance. 'Showroom clean' only happens when a bike is new, or after a complete rebuild. After that, it becomes an object to be ridden more than admired, and routine maintenance/cleaning is usually quite adequate.