I have not been able to find any topic pertaining to this on the site but please excuse me if this is a duplicate posting. I remember years ago there was a system that slowly injected water into the engine using engine vacuum to slowly bubble water and pull vapor into the engine. This got me to thinking about a system that might allow for the very slow bleed of a solution of intake valve cleaner to do the same thing on GDI engines to prevent crud build up on the intake valves. Has anyone ever tried this? My thinking was something like a PEA cleaner diluted with a solvent like MMO (or any other compatible combustible solvent of your choice) slowly pulled through the system. Perhaps a usage rate of 100 mls per 500 miles or so (all depends on the strenght of the solution). An easy to refill bottle would be the ideal container for such a solution with the injection mechanism as part of the lid. Thoughts, please!