It's just a car shampoo. Foam is for advertising only. I used foam on both machines today. I've used it 4 times in a row. Yes I have washed my cars 4 times to see how long it takes the foam to remove the dirt. 5 minutes, 10 minutes and nothing. I am attaching a photo as proof. I'm from Europe and I go to a car wash there and they use foam to wash. Nobody touches the car and the dirt can be easily removed. You can see it with your own eyes. I moved in with us and the people here don't know how the foam is supposed to work, my English and last puc my pressure washer. Super strong but it didn't help. Sorry for the low rating, but please don't fool people with unprofessional products. Of course I'll use the whole gallon and if something happens I'll remove my comment but for now it's 1 star
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