Hi
We've used dry wash since it came out.
Used the Armorall Tissues first, which are supposed to be used by the magazines whilst reviewing cars.
Both used properly give (pardon the pun) brilliant results.
As has been said we don't use them when either the car or caravan are particularily mucked up though, we give the standard wash off and wax.
Because the caravan is stored where washing isn't always a very easy option we've found the dry wash gives great results especially with the black streaks. The after finish is great as well as water just beads off as if waxed.
Windows come up wonderfully as well.
At one site the warden was convinced we'd spent hours waxing both car and caravan, so as I say used as per instructions it's great.