If you are talking about regular plasterboard walls painted with an oil base paint, just about any household cleaner will do. You can use Mr. Clean, Dawn, Pinesol, ammonia (which I find too stinky!) in water these are just products that I can think of, a couple of cap fulls in about a 1/2 -3/4 gal of water is good. Many people swear by vinegar and water, but I think actual soap/detergent based products are better for walls, especially if they have smoke or accumulated dirt or cooking grease on them. You can also use bleach in water, but I would only do that if there is mildew. For washing walls, you don't need anything special.
By
07/20/2010
There is a product called Dirtex which I love. It's a small box of power/crystals you mix with water and wipe your walls with. You can buy it at hardware stores or larger home improvement stores. It's wonderful stuff, and no smell or harsh chemicals.
Here are archived discussions related to this page.
My walls are staining, as the windows are not always kept open in the apartment. How do I clean up the walls which are painted with a water based paint and get rid of all the black marks on it?
Natasha from Malaysia
RE: Cleaning Painted Walls
Use a product called "TSP." It can be found in most hardware stores. Great for dirt and grease. It is a granule that you mix with water. (07/27/2006)
The black marks on your wall could be mold. Try using some bleach mixed with water in a spray bottle to kill the mold first and then repaint with paint used to kill mold. (07/30/2006)