Injectors needing a cleaning is kind of a farce nowadays as long as you use a Top Tier gasoline. Your injector may wear over time but you will find they will almost always be very clean unless you get bad gas (stay away from discount stations). Plus many states already run up to 10% Ethanol in their gas which more than necessary to clean anything the Petroleum detergents don't get. Never listed to anybody that tells you to add E85 to clean your injectors.
P.S. I won't go into the Farce of even having Gasohol in this country. Cost taxpayers more, bad for vehicles, doesn't help emissions as claimed, etc...