Here is the real answer.  The middle ear drains into the nose.  Therefore, you need to treat the nose.  I agree with the decongestant suggestions.  But wait!!  There is more!  You need to treat the nose.  Wash it out with salt water. [Boil one quart of water and add one teaspoon of salt when it has cooled. Be a man and sniff it out of your hand.  Or be like me and buy a spray bottle from the dollar store.  Be sure you clean it out well.  Dilute bleach (1:4 or more) and rinse it at least three times.] Gently blow the goop out.  AND THEN; use a spray of generic Afrin.  Do follow the suggestions on the bottle.

Jay