Carbon Buildup = Fuel Injection Flush???

[zfarsh]

so guys, living in Canada and having driven 90,000 km, should i (or when should i) do the Fuel Injector Flush and the Throttle Body, to remove the carbon buildup and whatever else benifit it may give, at 175 $ + 50 $ (no, i am not rich, far from it), or should i try the Chevron Techron method? Will this remove the carbon build-up...is it even bad to have the carbon build-up?