Bosch fuel injector cleaning?

[BMW-F1-FAN]

I want to clean my injectors while they are out of the car. Does anyone know what intermittent voltage I can apply to have my fuel injector piston move back and forth? I want to backflush with carb/injector cleaner using compressed air. I have new pintle caps, spacers and o-rings to boot. I read a procedure for Porsche 944 injector cleaning and the autor recommended using a charger with a 2mv setting. Any help would be appreciated.

[billy in slo]

you can use a 9v batt.

[BMW-F1-FAN]

Thanks it worked like a charm.

you can use a 9v batt.