Wash walls and ceilings with a mild detergent in warm water. Rinse well and allow to air dry. Do not use abrasive sponges or scouring pads as they may damage the paint or wallpaper.

There is no definitive answer to this question as the best way to wash walls and ceilings will vary depending on the material used in their construction. However, a general rule of thumb is to use a mild detergent or soap solution and a soft cloth or sponge. Be sure to rinse thoroughly afterwards and dry any wet surfaces with a clean cloth.