What are you washing your car with? I use Wolfgang Concours Series WG-3700 Uber Rinse Less Wash, and the two-bucket wash method. The polymers in the wash protect and seal the surface and prevents water spotting. And with the two bucket method and rinse-less wash, you are washing and drying the car in sections, so no water is left on the car to dry and spot anyway. A final quick treatment with a good detailing spritz sealant further protects the hood and in particular the carbon fiber roof panel, which can be prone to sun/chemical damage. I use the Wolfgang Concours spritz sealant. Yeah, sounds like a ad for the stuff, but got sold on the Wolfgang brand after seeing several owners at high-end car shows using it prepping their cars. If the owner of a half-million dollar Lamborghini is using it....