First, clean the exterior of your windshield to remove dirt and road oils. This makes it easier to see the dirt and grease that is on the interior. Use your normal cleaning method for the exterior, which can be a commercial car wash. For the interior, there are different preferences for products and materials to use for cleaning windshields. This method is one we have seen work well, but you may have one that you like better. Sit in the passenger seat when cleaning to get a better reach. Step 1 – Remove as much of the greasy layer as possible using a clean microfiber cloth. Use a circular motion on one side of the cloth, then flip it over and wipe the windshield vertically, up, and down. Don’t let the microfiber touch the dashboard because it will pick up oils and then transfer them to the windshield. Step 2 – Use either rubbing alcohol and a clean microfiber cloth or, life hack, a wet Mr. Clean Magic Eraser, to break up the remaining grease on the windshield, using a circular motion to wet the windshield. Again, don’t let your cleaning materials touch the dashboard. One caution, keep paper towels on hand to quickly wipe up any liquid that drops on the dashboard so you can prevent discoloration. Step 3 – Before the glass dries, use a clean microfiber towel to dry off the windshield. Use a circular motion to absorb the water which now holds all the remaining grease and dirt from the windshield. Step 4 – Use your favorite glass cleaner sprayed into a clean microfiber cloth and wipe the windshield again in circular motions, then flip the cloth over and wipe straight up and down, as in Step 1.