Fuel Injector Cleaners Safe???

the manual says dont use any but the manual also says not to use this and that but we always use em lol

it says not to add fuel injector cleaners to ur tank, but can we? i think we can and i think its safe, what do u guys think?

I live in illinois and stations sell gasahol (10% alcohol) or regular. I burn the 10% and figure that is better and cheaper than adding injector cleaner. if we did not have 10% i would be adding a pint every now and then. have a F250 with 225,000 and never had the injectors out. Sable with 90,000 never had the injectors out. Explorer with 60,000 same thing.