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what you could do is pull your injectors and test them for flow. If they are flowing the proper amount of fuel, then they don't need to be cleaned or anything.
All you need is a graduated cylinder, a battery (9v works well), a watch, and your fuel rail/fpr/and injectors removed from the car, but still attached to the fuel source.
Attach the battery to the contacts on a single injector, and let it flow for 1 min into the Graduated Cylinder. The amount left is the cc/min flow.
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