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If i was your neighbor and saw that setup....i would think you were nuts haha.I’ve gone through a few classic Gilmours with brass parts. The ideal set up is to have two hoses with a foam gun on each for each side of the car.
I’m not going to go through the hassle of setting up a PW every time I want to wash. It’s not the volume of foam that interests me, it’s the flowing soapy mix a foam gun affords. If you constantly flow the mix over the point on the paint, you flush away the dirt and have a barrier that guards against marring. In other words, you don’t just foam down the car and start washing, you wash while foaming and yes, you go through a lot of soap. If the car is barely dirty, you might be able to get away with foaming and then rinsing, but the dirtier the car is, the more you’re going to want to foam while washing. This method works for me. I don’t even know where my polishers are any more.
The hassle factor is definitely valid.
I think myself and a lot of others have set up their power washer and hose setup to basically eliminate this. I've learned that you don't need some mega expensive Obsessed Garage style setup to do this.
a foam gun shouldn't be used only to pre-foam, but more as a washing tool. it eliminates two buckets but i still use one to rinse with an occasional blast from the water gun. if you're looking to pre-foam, you would be better off with a foam cannon/pressure washer set up. i'm not a fan of foaming up the whole car (with a foam cannon) then washing it, and only rinsing off at the end. dirt/contamination sits on the finish, you aren't rinsing off the mitt as frequently (potential scratching/marring), and the car wash dries up which can make it harder to rinse off and cause water spotting. i love my foam gun and the only one that i prefer is the gilmour with the brass components and pin/lever bar (5 dilution settings). in the end, everyone has their own method and if it works for you then that's all that matters...