I purchased this when I was rebuilding the carburetors on my motorcycle - as they say, a picture is worth a thousand words. The attached image is the 'before and after' (twin carb bike). And while I did brush away some of the easier to remove dirt, the ultrasonic cleaner (along with some orange Zep degreaser - it did not adversely affect the aluminum) took it from the two extremes shown.When I started the unit up I decided to help out the heater and when I was mixing up the degrease solution I used hot water - I figure let's give this thing every change of living a long life.While I figured this thing would do something, I just could not believe how much it would do. I wish I had this thing years ago, my hands don't like doing the scrubbing and polishing any more.