Step #5: Start Top-Down Cleaning
Begin at the top of the wall and work your way down to eliminate streaks from running down. Work in small, manageable sections, rubbing gently in a circular motion. Once done, dry the area with a clean, dry cloth. If water isn't strong enough for surface stains, try a diluted dish detergent or an eco-friendly, all-natural cleaner like vinegar. Remember that vinegar may yield distinct smells that are unpleasant to some, so be sure to rinse the wall with clean water.
Step #6: Get Tough on Tougher Stains
For deeply embedded stains—think lipstick and wine—add two tablespoons of ammonia or dishwashing soap to a gallon of warm water. First test this solution in an inconspicuous area and expect some potentially strong smells. If the finish looks the same as the untested area, then continue.