Nothing brightens up a room like a fresh coat of paint. And, because it’s a relatively low-cost, high-reward makeover, you may encounter multiple layers of paint already on your walls. If you have ...

As soon as you notice a stain, gently remove any wet paint with a spoon or dull edge—don’t rub it in more deeply. Depending on the paint type (latex or oil), dab a little dishwashing liquid, rubbing ...