One thing you want to remember is to spray is down twice with fresh water. The first spraying puts the salt in solution, then the second rinses it off. If you don't use salt away, I put some dishwashing liquid in the flush hose before I hook it up. Not sure if it helps any, but it makes me feel better, and also I know when I quit seeing bubbles, it has flushed completely through the engine. Remember, rust never sleeps!