I first got interested in getting a foam gun after corresponding with Accumulator ( extreme washing technique) from Autopia.
It is a hose nozzle attached to a siphon with mixing bottle. You can adjust the ratio of the chemical you want to make foam with ( car wash in this case) by sliding an adjuster bar into the appropriate slot. You can toggle the adjuster bar switch to go back and forth between foam and rinse and the gun's quick disconnect allows the nozzle to be used like any ordinary hose nozzle, to just shoot water.
The purpose of this tool in washing a car is to to pre treat the car with soap, wash using lots of lubrication from the continuous stream of foam and I've found can also make claying very easy as well with a continous flow of soap solution over the paint.
Accumulator's extreme washing technique works great with this foam gun. I just use the foam gun in one hand and a mitt in the other rather than the mitt *over* the gun itself. less cumbersome for me. It is involved and you really can only wash a small area at a time. It's for those overly obsessed about marring the finish during washing.
I've found I can rinse and wash and car that is only slightly dirty but too dirty for a QDing without touching the car at all: Wet the car, shoot the foam, rinse, repeat maybe once if necessary, then dry.
The exact same foam gun Accumulator and I have can only been seen at
http://www.automagic.com. It seems to me this the only true professional foam gun best suited for this purpose. It's a lot more than what I paid for mine. I got mine locally at a detailing store in Piscataway, NJ.
It's made by Gilmour but AFAIK, they have no website so perhaps you would need to call them.
Handy tool for the extreme enthusist
