Sunbrella fabric and similar outdoor fabrics are made to resist mold and mildew, but that doesn't mean they're mold-proof. So, if you notice set-in mold, follow this cleaning protocol.

QWe have seven-inch round ducts in the ceiling of our house, for heating and air conditioning. In a little-used room, we’ve never bothered to find ceiling diffusers for them. Now that we’d ...