The first, remove floor mats and vacuum the mats, floor, trunk, upholstery, rear parcel shelf, if you have one, and the dash. Slide the seats all the way forward and then back to thoroughly vacuum the carpet underneath. Start from the top and work your way down. Clean carpet or upholstery stains by applying a foam cleanser and rubbing it in with a damp cloth or sponge. Allow it to sit for a few minutes before blotting dry with a towel. If the stain doesn't come out, repeat. Repair carpet holes, burns or small permanent stains by cutting the spot out with a razor blade or scissors. Replace with a piece you've cut from a hidden place, such as underneath the seat. Use a water-resistant adhesive to keep it down.