Waxes and sealant contain UV blockers in their formulations. This helps reduce the amount on UV light from hitting the paints causing fading or oxidation of the paint. If you want to make you paint look newer, longer; use a wax or sealant every 3 months or so, depending on wash practices. Touchless washes and drive through washes will strip almost all the wax so it is best to give it so TLC with so automotive shampoo instead. Dish soap is not for automotive use and should be used on your greasy dishes and not your dirty car.