My antique cherry drop leaf table. This is what happens to unprotected wood.
I used several different products to get rid of the white rings. A paste of white toothpaste and baking soda worked the best.
The paste should be the consistency of icing.
Smear the mixture on the watermarks. Do not let this dry. Begin rubbing in circular motion immediately with a damp rag. Make sure you get all the mixture off the wood with as little water as possible. When the wood has dried use your favorite furniture polish to help preserve the wood.
The piece of furniture after treatment on the watermarks.