I have an autobrite lance, karcher commercial pressure washer and bilt hamber autofoam. I never managed to get it to foam up like in the above photos and don't think it actually made the car any cleaner/easier to clean.
Maybe I'm just doing something wrong?
Depends what foam you are using tbh. The Bilt hamber isn't one that foams up alot, instead it cleans very well. Leave it for 4-5 minutes maximum.. don't let it dry on the car.
Rule of thumb is 1 inch foaming solution. Set you lance to the most negative (-) point then just turn it ever so slightly.
The dials confuse people but + is more water instead of more foaming solution.
Hope that helps.
At the moment I am using Megs Hyperwash as my foaming solution, it doesn't foam up really thick but has extremely good cleaning power vs. alot of dedicated foams.