No matter how careful you might be, water stains on wood furniture are bound to happen eventually.But don’t panic! You can usually remove the stains with items you already have. Here's how:.The acids in mayonnaise draw out the water while giving the wood a boost of gentle, oily nourishment. .Petroleum jelly can gently penetrate the wood's surface without damaging it, much like it does on your skin. .Try gently rubbing some white, non-gel toothpaste on the stain with a clean, dry rag or sponge. .Steel wool is effective at removing many kinds of stains, but remember to tread lightly when using it on wood.Using a dry rag or sponge, try rubbing a 50/50 oil-vinegar mixture into the stain