Perform cleaning in a shady area so the detergent doesn’t dry out on the surface. You can remove the cover before cleaning or leave it on your vehicle. 1. Rinse your bed cover with water. 2. Make sure that the car washing solution you are going to use is safe for your type of bed cover and apply it to the surface. If not, you will have to use a specific cleaner (vinyl cleaner, tonneau cover cleaner, etc.). 3. You can use a microfiber cleaning cloth or brush with a long handle to clean up the cover. Spread the remedy over the surface from the center to the edges without applying excessive pressure. 4. Scrub the especially dirty areas particularly if necessary. 5. Once the cleaning is done, rinse the cover with water and leave it to dry.