Over time, painted walls can be subjected ... that ruined my sofa How to remove mattress stains and smells — get rid of pee, vomit, yellow marks and more I found the secret to streak-free ...

If you notice a musty smell along with the stains, you could have a mold issue. Removing yellow marks depends on what’s causing them. Related: Can You Paint Over Textured Walls? Yes, they can.