I know a thing or two about how to clean walls. The two worst experiences I’ve had with dirty walls both occurred while I was renting apartments up in Bemidji MN. The first these, when we moved in, aside from having little nasty dirty hand prints all over hell, was also riddled with spit balls. I did my wall cleaning in that building wearing a dust mask, a wide brimmed hat, and rubber gloves. It was disgusting. The other place I lived in that suffered from a severe lack of any clean wall surfaces was just a few blocks away and had what appeared to be poop smears on the bedroom wall. I would like to believe they were paint smears, but I can’t. It washed off too easily. When it comes to cleaning walls in apartments, those two were definitely the worst. But pretty much every place I’ve lived in (current apartment excluded) has required me to put my knowledge of how to clean painted walls to use. If you would like to know how to clean walls and how to wash walls…please…check out this article.