Quoted from JPscranton:

I have been using a harbor freight ultrasonic cleaner now since about 2009. It works great for just about everything and is the only way I shop pins now. It is ESPECIALLY useful for EM machines, just seems to work wonders on caked up grease on score reels, stepper unit parts etc. Its been my secret weapon for a long time. I HIGHLY sugest anyone who plans to shop more than 1 pin in their lifetime to get one, not just for pins but it works great if you work on cars, other electronics, etc.