Hello Edie, Wipe them over and if still dirty, then repaint them.
Take a magic eraser and warm water and scrub! Had my floor replaced with tile and my walls were covered with grout, all of it came off!
Clorox cleanup works great on walls
Wash them! I use a vinegar water solution.
Hi Edie: If you are going to wash your walls, clean from the bottom to the top. If you start at the top, the water that runs down has dirt in it and will leave rivulets as it runs down onto the dirty walls and those things are really hard, if not impossible, to clean off. If the wall is clean where the water runs down, it's much easier to wipe off. Also, if you are going to wear rubber gloves, make a cuff in them so that the water that runs down the glove will collect in the cuff and not in your armpit:) Good luck