[12Ounce]

If you mean bench cleaning, ...it may be OK. I have rigged up a pressurized bench manifold that will allow me to force some cleaner-rich gasoline thru the injectors. The injectors are fired with brief pulses of 12volts. Then the outside of the nozzle tip is brushed clean. I'm not sure this does that much good or is needed usually ... it kinda "covers the bases", and makes me feel good. Never soak the injector body in anything.

If you mean adding a cleaner to the tank, it may also be OK if the engine is running good to start with ... just be sure you don't overadd as the catalytic converters and sensors will be at risk if any cleaner passes thru the combustion chamber unburned.