I'm not quite sure it is even possible to clean fuel injectors without expensive machines. Since they have variable valves to allow different flow rates, you need to have them in cleaning solutions while sending high pressure solution through them, all while adjusting the flow rate up and down.
I would suggest finding a local speed shop and ask them if they know anyone that does true injector cleaning, and make sure it isn't simply tossing them in a solution.
EDIT: There are tons of DIY videos on youtube using cleaning sprays (brake or carb), I'm not sure if I would do this, I would either replace all of the injectors, or take them to a speed shop, and have them clean and test them.
