here's a good example of the utility of an ultrasonic cleaner - bottom line = worth every penny ($80 from Harbor Freight). Plug it in, I filled it with 1/2 purple power and 1/2 water, turn on the heater and let it get all nice n happy, drop in a set of 125k-mile untouched rockers and hardware and push rods right off the engine, and here's a few pics of just how well the thing works - I literally did nothing except drop 'em in the tank and pusha da button