Toothpaste: Nix Stubborn Water Rings from Wood Furniture. With a slightly damp, soft cloth, rub a pea-sized amount of toothpaste into the stain. Wipe off excess paste with a clean cloth. Repeat if necessary.
How to remove water rings from wooden furniture. Moisturize wood with olive oil. Use hairdryer to heat on high. After about 20 minutes the stain was almost completely gone. We put a little olive oil on it to moisturize the wood. The results were amazing!