Water Rings on Wood... Set a cold drink on your wood furniture without using a coaster and you’ll leave a round reminder not to do it again. To remove it, dip a white cloth in a mixture of equal parts vinegar and vegetable oil, and rub out the stain, wiping with the grain. Then clean the area with a dry cloth to make the wood shine. You can also remove water rings from leather furniture by dabbing them with vinegar on a cloth.
Recipe for removing Water Stains and marks from furniture: Olive Oil Table Salt Mix the olive oil and the salt in a bowl to make a thick paste. Then, simply rub the paste onto the damaged area. I made mine pretty thick, and just sat it on the areas where I had damage. Leave sit for approximately :30 minutes, and wipe all excess paste off of furniture. All of the stains will magically be gone!
How to Restore Scratched, Stained, and Worn Wood : another pinner says, "for watermarks - mix a thick paste of olive oil and salt and rub onto the wood - leave it for about 30 minutes. The salt draws out the moisture and the oil feeds the wood. Used this many, many times!"
How to remove water stains / rings from wood furniture! This works! I tried every other thing on the Internet and failed! This worked within minutes!!! I had a huge water heat stain from a hot pot on a wet cloth!