Mix equal parts of white vinegar and warm water in a container. Add 1 tablespoon of baking soda per 2 cups of liquid in a clean container. Mix thoroughly. Use enough liquid to completely cover the PVC item.
Place the PVC into the solution and set it in a warm, well-ventilated area until the solution evaporates.
Rinse off the PVC under clean water to remove any residue from the baking soda.
Place the item outdoors to dry in a sunny, breezy area for several hours.