Sea Foam Motor Treatment, Chevron Techron Concentrate Plus and Lucas Oil Fuel Treatment are quality diesel injector cleaning products, according to HCDMAG.com. These products also work on gasoline engines.
Sea Foam Motor Treatment is a blend of cleaning oil and lubricant that may be mixed with engine oil or poured directly into the fuel tank. The most effective way to clean injectors with this product, however, is to pour it into a hose connected to the engine's fuel cylinders.
Chevron Techron Concentrate Plus is also an excellent injector cleaner for diesel engines. A single application of this powerful product thoroughly cleans most engines, although severely soiled injectors may require a second treatment.