Sounds like it might need a total refinishing...
You can quickly hand-sand it down to bare wood all over with Sanding Sponges in 15-30 minutes
(DO NOT USE POWER TOOLS)...and apply Tung Oil, it will bring out the beauty of the natural wood
The reason I say don't use power tools...most folks can't do it without messing up. Quite often power sanders will leave SWIRL marks...which create a whole new problem.
With sanding sponges, you CAN'T mess up.