One of the most interesting things that I have found for cleaning my RV is Dow Scubbing Bubbles. It can be used as a black streak remover, tar and nicotine stain remover, carpet cleaner, well you get the picture. A lady I know uses it to clean the whole outside of her trailer before she has the kids wax it. She sprays it on and only has to use a brush where its real dirty. Then she just hoses it off. When I quit smoking I took it to the whole inside of my Airstream. You should have seen how well it worked at removing all the stains on the walls and cieling. Had to put paper on the floor to catch any drips but worked great.