If you go to an automatic car wash, with brushes, these can add imperfections to the clear coating on your car! A hand-wash car wash is best, but, whether this is a do-it-yourself or professional one, be sure the towels used are microfiber as they are the best to use. Old kitchen and bath towels are very abrasive. Also, using two buckets, one for washing and one for rinsing is safest too. Don’t over wash in the Winter either. Did you know that road salt id worse when it combines with water? Lastly, clean your windshield in the shade. When you are in the sunshine it dries quicker than you can clean it thus leaving streaks.