perhaps they all were scratching there head like I was at first, and some may still... After you added the BG to it, I knew what you were talking about, but have never used it personally. When you ask a question, it is best to add more info, so that everyone else is clear what it is you are asking... I used to use it at a Ford dealer I worked at, but as for personal experience, I don't have any. It is supposed to be able to clean all the carbon and gunk off the valves. I have seen demonstrations, but as I have said personal experience is not there.