Originally Posted by WD40

Do you want my opinion? Yes you do. You want my opinion because research takes time... time I'm not getting paid for!!! 🤣🤣 Besides, research isn't fun (that's why people get PAID to do it)! But I'm happy to give my opinion, as that's what you've paid for. So, my opinion is that MOST OF THE TIME no chemical bond at all exists between a water drop and a car's windshield or painted surface. The minerals contained in the droplet (after the H2O evaporates) have merely mechanically bonded to your car's surface. What does that mean, you ask? A bug climbing up a vertical wall also has a mechanical bond, if you will. It wedges its spiky-bits into small crevices to counteract the force of gravity. Well the minerals a water-droplet leaves behind "contour themselves" into any irregular surfaces (even microscopic ones) that your car provides. Waxes & ceramics work by filling-in these irregularities thereby creating a smooth(er) surface, making it harder for debris to cling to it. That's my opinion. Before complaining, remember how much you paid me! 😁