Using these splash guards is a breeze. First, gather all the included hardware and 3M tape. Clean the area on the rear bumper where you'll be installing the guards to ensure a good adhesion. Then, simply align the guards with the holes on the bumper and attach them using the provided hardware and tape. As for maintenance, a regular car wash with mild soap and water is enough to keep them clean. Just be gentle to avoid any scratches. Remember, if you had rear spats or some mud flaps installed before, you'll likely need to modify them for these splash guards to fit properly. Keep an eye on the attachment points during your regular car checks to make sure everything stays secure.