Examine the Stain
Not all water stains look the same and should not be treated with the same methods. A crucial step before you begin removing water rings is to examine them. You should look at their color because they will determine how to approach removal.
The stain will either be dark or light. This difference arises from the duration and depth of water on the wood surface.
Light water stains: Light water stains appear white, light-colored, and cloudy. They are more recent, meaning the water has penetrated only the surface coating of the wood. Most of the methods enlisted below are for these stains.
Dark water stains: When the light stains are neglected, they'll eventually turn into dark water stains on wood. These dark-colored stains, which may be brown or black, are caused when moisture penetrates the wood, causing mold growth. These occur deep in the wood structure, making them harder to eliminate or clean up.