The wall is the "face" of the home space, but it is inevitable that it will be stained with dust, fingerprints, oil stains and other stains during daily use, which will affect its appearance. If the cleaning method is improper, it may also cause the wall to fade, peel or paint to peel off. In fact, there are rules to follow for cleaning painted walls. As long as you master the correct methods, you can protect the wall while removing stains. The following are specific cleaning techniques and precautions th…