I read most of the responses and disagree with many. My ex-husband and I had the same problem. We are not smokers, we used the magic eraser to have it take paint off the walls and leave the finnish weird, Fantastik, 409, Lysol, and Mr. Clean, nothing removed the difference in paint colors. We repainted and moved the vaporizer into the center of the room. It has something to do with the heat, water, and paint. We had well water and it bleached out where the drips were (hard water sometimes doeas that). We could not fix it unless we painted it or put up a border. I used cheap paint the first time, so I used a better paint the next time.