Easy to use. I fill tank, let it heat up before starting the cleaning process. This may take up to a hour. Add objects to be cleaned and set timer to desired length of time. It does a great job cleaning, especially in hard to reach places.I have used it on a couple of carburetors that appeared to be reasonably clean, one a Holley 4 barrel the other a Kawasaki and was amazed at the dirt that was left in bottom of tank. I am satisfied with this product.