This is a weird question, and IDK if there’s a specific answer.
I manage a couple carwashes in Cincinnati, and often help run the line, pressure-washing cars as a preparation to entering the tunnel wash.
We prep the cars to help the machine wash certain areas that are more difficult for the cloth to clean, generally the front, windshield and the back of a car, plus any mud, bird droppings or bugs that need removal.
It’s bug season now, and every year I notice this. Bugs are much more difficult to spray off of white and silver-colored cars than any other color. We always have to use a bug release chemical to help erode their remains so that they can be then sprayed off.
Is there any particular reason why this would be so?