Originally Posted by D Dale

Oxalic Acid (another form of wood bleach) will get rid of water rings/stains. DO NOT use vaseline. Wood bleach can be ordered from Woodcraft, Highland Hardware, Constantines, etc. Older veneers ARE thicker than new veneers but you will still sand through them easily so bleach would be the best way to go. Oxalic acid will also remove rust stains and ink stains.

Originally Posted by D Dale

Also, to remove water rings, you can use toothpaste and a soft toothbrush to remove them without damaging the finish.