Car drying aids, add hydrophobic properties that reduce water spotting and scratching during the drying process on your car paintwork.
Research into paintwork scratches and swirls during a wash stage showed that a good proportion of these come during the drying stage. Understandably so when you think that during the wash stage, a car has constant lubrication with water and shampoo, but whilst drying, the paintwork will have no protection. Add a drying aid into the mix and you have created another barrier of protection.
Car drying aids do more than just reducing swirls. They also stop water-spotting and make the paintwork surface slightly hydrophobic. If you use this in conjunction with water filters, car air blowers and a drying towel, you will achieve the best possible result. Ensure that they do not dry, so it is best to work panel by panel.