Q: The concrete steps at my house are moldy and kind of green on the risers, except where I applied a concrete sealer. I did it badly, so you can see areas that look like drips. How can I safely clean ...

A shady patio may be a welcome spot to escape the Southern heat, but it can also create a damp environment that invites mildew and mold. Trees, shrubs, and structures that hang over your driveway and ...