I am reworking my selfserve stand and noticed that the only thing I am injecting air into to make foam is my low pressure tire cleaner and foam brush. Shouldn't I be injecting air into my low pressure presoak also? Can I use the same airline that injects air into my tire cleaner to inject air into my presoak? I know I will have to rework some solenoid wiring to do this, but that is not a problem. My tire cleaner air ties into the manifold above the bay.