When I worked at the auto parts stores, we would have some slow days. One Sunday, with an average of 3 customers an hour, we decided to clean the injectors on a co workers Honda Accord.

We got a fuel pump, a 12v battery, some wire, hoses, and a bottle of fuel injector cleaner. Then we would apply 12v to the solenoid on the injectors, turn the pump on, and ran it through. Worked out pretty well, his car was definetly a little peppier after that.

However, this is probably very bad advice, we just thought it was worth a shot.