First, make sure there is plenty of ventilation, then make a paste of salt and turpentine. Mix 1/4 cup of turpentine and 2 to 3 tablespoons of salt -- just regular table salt. Use a stiff, nylon bristle brush and plenty of elbow grease to get the surface clean. Sop up the excess cleaner with a paper towel, let it dry and discard it. Wash the freshly cleaned fixture with mild soap and warm water. To prevent stains in the future, apply a coat of car- or boat wax to the surface. And that's the On The House tip for today.