1. Gather your materials. You will need:
* A mild detergent
* A sponge
* A bucket of warm water
* A towel
2. Test the detergent on a small area of the wall. This will ensure that the detergent does not damage the paint or wallpaper.
3. Apply the detergent to the smoke stain. Use the sponge to apply the detergent to the stain in a circular motion.
4. Rinse the detergent off the wall. Use the sponge to rinse the detergent off the wall in a circular motion.
5. Blot the wall dry with the towel.
6. Repeat steps 3-5 if necessary.
7. Paint the wall over. If you have a light wall color, you may be able to use paint to cover up the smoke stains. Paint over the stains with a color that matches your wall.