I’ve tried these products, expecting the dirt to lift off leaving the car spotless......it’s introduced through the pressure washer using a large nozzle so the lance pressure is reduced.
Does it work?
No.
One of the better products is the unfortunately named Muc Off aimed at bikers.....now that is good and not aggressive.
John
I have the same, and I agree with Burnerman : waste of time.
I don't bother with the pressure washer at all now, for car washing: a bucket for the wheels, another for the body, and a builder's tub full of clean water for rinsing off (a bucket worth at a time)
Bilt hamber auto foam or their touchless are very good at lifting most of the traffic film but as said they dont get all of it off.
They are designed to help remove the worst of the dirt before a contact wash so you dont rub in any grit etc and cause marring to the paint.
I used BH clay on the Honda before we sold it and it shifted a load of stuck-on carp. The panels felt like glass afterwards. A good polish and wax and the car looked like new.
The guy who bought it rang me up and said how marvellous it looked for its age and mileage.