I just bought a 10 amp 1400? psi electric pressure washer. It has been suggested I buy a "foam cannon" to work with that. I'm not sure how foaming the engine (primary goal to clean engine) or the car does any cleaning, but I'll try it if not too expensive, I guess with special foam cannon soap? e-bay or Amazon (I've got prime) reasonable $25??. Thoughts, comments? It already comes with an inline soap tank but haven't figured how to clip it on. Thanks!