Whenever you are washing your car in the driveway, go ahead and take a pass at your garage door. User car wash soap. For any stubborn marks, use an all-purpose detergent, and avoid any abrasive cleaners.
Don’t neglect the inside of your door. Any dirt that builds up over the winter can reduce the long-term shine of your door.
If you’d like your door to keep its brand-new appearance, once a year apply liquid car wax to it on a cloudy day in order to protect its luster and restore its shine.