They are still subjected to contamination from elements such as bird droppings, bugs, tree sap, industrial fallout and airborne pollutants. When choosing a wax, make sure it is the right product for your paint. Check the label to see if the wax can be used on clear-coat finishes. Most waxes on the market can be used on clear coats, but there are exceptions. Clear coat paints are quite thin and an abrasive wax may damage the finish.
Car enthusiasts recommend using a carnauba wax.
It gives your car a great look, but use caution. It is the hardest natural wax available. If you see a wax that says it's pure carnauba, it means the part that is carnauba is pure, not that it's 100-percent carnauba. Start with a mild wax and go to a more abrasive product if you feel your car needs more protection. In addition, select a quality wax.