Works good if you use it every single car wash. Really doesn't work if you live anywhere that rains or gets cold dew on the car. It is water soluble. I use this on my car here in california because it makes washing bugs off the front easy and touch-less. If it rains where you live, then it washes right off.
Current Stable: Some Audi with a V10, Couple of BMW's, one F Car, and one P car. One lonely GT-R with all the Euros.