How do I get the dried wax out of the grain in the wood?

It depends on the whether the surface of the wood has been sealed with a polish or if it is bare wood. Also I'm assuming you are referring to old wax furniture polish as opposed to candle wax. 1) Try this on a small area first. On an unbroken sealed surface, pour a little white spirit (mineral spirits). Let it soak in a for a minute or two. 2) Using a soft, absorbent cloth with some pressure, wipe the area in the direction of the grain. You may need to repeat this procedure several times. Do not do this on a broken or cracked finish as the white spirit will creep under the surface.