Make a paste out of two tablespoons of salt and a half cup of turpentine. Apply the paste with a sponge or a nylon brush, but don't allow it to go down the drain. The mixture can be pretty strong-smelling so make sure that there is plenty of ventilation. You should also wear rubber gloves and eye protection.
Using paper towels wipe up the product and allow them to air dry before disposing of them in the garbage.