Reflections Detailing of Utah
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While foam attachments on a pressure washer look very cool, they offer little to no actual benefit over a regular foam gun, and from my discussion with several soap manufacturers may actually DECREASE the performance.
The key to a successful car soap is the surfactants in the soap. These are chemicals that `break` the surface tension of the water, which make the water wetter, and allow it to penetrate and thus encapsulate dirt and grime.
The additional agitation that a pressure washer adds introduces more air (and thus creates more foam) but serves no real functional benefit.
To answer the earlier question, foam guns can be used as a presoak or to wash the car. If you use it to wash the car, I recommend still using a one bucket approach to rinse the wash media, and to keep to flush the surface with the soapy foam as you wash it.
to each their own, I have a foam gun, and a foam cannon/pressure washer, and I pretty much have no use for my foam gun anymore. The thing is with foam gun foam is gone off the car in 2-3 minutes, where with foam cannon it sits there up to 10 minutes, helping break off the dirt and grime. And consider a good pressure washer rinse after that, and most of the dirt and grime will be gone...Also it shots a nice snow foam which looks/sticks to the car like shaving cream.
I have both a foam gun and foam cannon and find myself hardly ever using them on my own cars. I wash my cars frequently with the 2BM so that stay relatively clean. The foam gun and cannon seems to me to be overkill on a clean car.
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