[soapwarehouse]

The tempature of the truck itself could also be the problem. If the truck was hot from sitting out in the sun it would need to be cooled down first with a water rinse before adding the soap. Especially on glass, you can get white streaks from the soap cooking on the hot glass. It is alot harder to get off once that happens but it can with a little elbow grease. What was the soap you where using? What main ingredients?