TheCommi and Onetime_77 both make excellent points.
Some injectors (in our experience a very small %) will require removal to be cleaned. Typically these injectors are in vehicles with tons of mileage and the owner has been less than particular about the fuel they use and doing proper engine maintenance. In these instances the use of cleaning equipment is often the best and most effective way. However if you don't meet these criteria, I'd suggest a can of 44K first. Most of the time, about 95% of the cars we work on, 44K will clean the injectors and restore the flow rate and fuel delivery volume to mfg's specs.
Additionally, if you're going to clean the injectors, definately clean the entire fuel delivery system. A professional strength poduct added to the tank will accomplish this without HUGE mechanics labor charge attached. (I know what our shop would charge to do a complete system cleaning....a can of 44K is a lot less expensive and does an equally good job.)
One thing I want to point out again, 44K is a professional strength product. BG doesn't sell it to the public because it is stronger than over the counter products you find at the gas station or in a parts store. If you decide to try it...DON'T get it on the paint, it will damage the finish. DO use it according to the directions, if you use it in a stronger solution that directed it will eat seals and gaskets. Unfortunately I found both of these out the hard way :-(