Griots Engine Cleaner is awsome ! Cover the alternator make sure the Engine is warm but not hot. Let the product sit and due the work. I like to Clean, Rinse, Clean, Rinse. When you rinse its with a gentle spary not a sharp nozzle. remember you are rinsing away the loosend oil and dirt not trying to blast it off. * Also I never clean an engine on a car older than 2000 without covering the electronic (PLUG) connections with cellophane wrap. Newer cars there is almost no issues with these.