Blot fresh water immediately with a dry cloth
Dry the area with a fan or hair dryer on low heat
Apply mayonnaise or petroleum jelly to white water rings
Let it sit for several hours or overnight
Wipe clean with a soft cloth
Rub the stain gently with non-gel white toothpaste
Wipe with a damp cloth
Dry the surface completely
Mix baking soda with a few drops of water
Rub the paste gently over the stain
Wipe clean and dry
Use fine steel wool with furniture wax for stubborn white stains
Rub lightly with the wood grain
Buff with a clean cloth
Apply wood polish or furniture wax
Sand dark water stains lightly with fine-grit sandpaper
Apply oxalic acid wood bleach to dark stains
Wipe clean after the stain fades
Let the wood dry fully
Re-stain the wood if needed
Seal the surface with polyurethane, varnish, or wax