Just so you know, he said foam gun. It's different than a foam cannon. Semi do the same thing but I say that very loosely. Look at videos of them and the foam cannons are on a different level, +9000. Foam guns are more like an extreme suds and soap sprayer. I have one as they don't require a pressure washer and a normal hose works. I use it as a prewash.
Also disagree on the clay mitt. A lot of detailers use them. Clay bars are best if you only wash your car, clay mitts are better if you have to wash a lot of cars
The issue with the clay mitt is that it is reusable.
Clay is a one use type of thing. If it is reusable, no matter how well you wash it, it is impossible to get absolutely everything out of it.
It probably works decently, but it will never work as well as clean new clay like you would normally use it. Less scouring and ultimately, fresh clay will pick up more contaminants.
Also, when you knead the clay, you bury the contaminants deep inside where the mitt has no way of doing that, so some of the contaminants will sit there and possibly scour.
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