You want to basically cover the entire car in foam now.
Here are a few snaps of the process...
Now let that dwell on the paint and start to remove the contamination.
If the car is dirty enough, you'll see some of the dirt sliding off with the foam. This is exactly what you want.
Notice the dirty line of foam under the side skirt?
Also, Notice that the brake dust is now running off the wheels a bit from letting the gel sit on it for a while.
I usually let the foam dwell until i see most of it has run off the car.
Its then time to rinse.
For this first rinse I use a high pressure. That will help get some of the loosened dirt off the paint.
