Fuel additives are strong solvents. When we pour such compositions to our fuel tank, their first action is to dissolve hydrocarbon scalings from the fuel tank. All the loosen up sediments pollute the strainer attached to the submersed fuel pump and the main fuel filter. Sometimes they are even choked. Remaining dirt flows inside the engine and so does the gunk cleaned from the injectors. That is the reason, worldwide, the auto professionals and websites recommend change of spark plugs, engine oil and filters after usage of fuel additives. They are not very friendly for rubber and plastic components in the fuel pump, regulator and fuel lines.
Larry Carley an internationally well-known automotive technical writer, says about fuel additives "There may be some risk to the vehicle's fuel system when using concentrated solvent to clean the injectors in place. Most equipment suppliers say to disconnect and plug the fuel return line so that solvent does not circulate back to the fuel tank. Strong solvents may attack rubber and plastic components in the fuel pump, regulator and fuel lines, creating additional problems that you don't need"
Ultrasonic cleaning is internationally accepted MOST effective process for cleaning fuel injectors. It restores like-new performance of your fuel injectors and makes your engine run on its peak. It is a comprehensive solution which is hassle free and cheap.