Petra Chor
Baking soda and a sponge works for me
Spock (rhp)
wash them with proper product in warm water, beginning at the bottom. replace soapy water as it becomes dirty.
Mike Lee
Wipe..with moist towel..
Snid
You wash them. I use Mr. Clean in warm water with a sponge rinsing the sponge often so as not to spread dirt around. If it's a tough stain I use a Mr. Clean eraser pad but you have to scrub gently when you use them or they will also remove the paint.
Dank
Buy the Clean Walls DLC