Water Marks and Toothpaste
Water marks can appear on vinyl furniture when water, or another liquid, has seeped through and taken up permanent residence deep within the fibers. They also happen when a beverage glass "sweats" and moisture forms a puddle at the bottom.
Remove water spots or other marks from vinyl furniture by rubbing them with non-gel toothpaste on a damp cloth. If the mark doesn't come clean on the first try, apply toothpaste again and leave it on longer this time. After a couple applications, the spot should be gone completely.