Have any of you ever noticed that when using the flood method for the final rinse some cars it works extremely well on whereas on others it still appears as if you rinsed with a nozzle attached? On my BMW and on my brother in laws Porsche this method works extremely well. It leaves very little water behind. On the other hand, when I did this to my sister's Avalanche and my other brother in laws Ford F150 there was still plenty of water left on the car. Does this have anything to do with how well the paint attracts water or is it something totally different?