Fuel Injector Cleaner?

anyway if you use it too often how can you tell the difference from not using it at all, do you actually open your engine to check the valves etc...
i don't think so!
i would actually be worried to use stuff that are not as such recommended by car manufacturers, paint stripper sounds rough, like the lads before i think good quality fuel and a cleaner every so often is probably enough, and it makes sense to do it before an oil change too.