Winter can leave your BMW looking tired and dusty. When the sun starts shining in Irvine, it shows every water spot and smudge on your car. Grab some quality car wash soap and a microfiber mitt to clean the exterior without scratching the paint. Pay close attention to the wheels and lower panels where road salt and grime tend to build up over the colder months. Once it's dry, apply a coat of wax to keep that glossy look going strong through summer.