I know redex is largely seen as a snake oil. But from what i am reading, people are trying to use it on relatively new cars or ones that do a lot of long distance driving. I however im thinking of using it in a van that is largely used a few times a week for short journeys, mainly local deliveries. Its only being driven for 15-30min max a few times a week at the moment. Its a Renault Master that is well over ten years old and a few years ago had a problem with the Exhaust Recycle Valve being so cagged with carbon it blocked it (it has since been cleaned). So im thinking of something to do to the system to help give it a clean through without having to strip it down. Im not expecting a complete clean out, that requires a mechanic, but more some general cleaning to show i some love. Is redex an idea on this instance, or is there a better product?