The quickest and most effective thing I know of (that you're likely to have available) is hydrogen peroxide. 'Just a few drops to a 1/4 teaspoon in each ear can be extremely effective. You can read 16 "Yea votes & stories" regarding hydrogen peroxide & earaches here: http://www.earthclinic.com/CURES/earache.html
(I don't suggest the next most popular remedy, which is inserting raw garlic...OUCH, that'd burn like Hades).
The best for getting out the wax and preventing/stopping earaches is Dr. Christopher's B&B tincture/garlic oil treatment. I wish I could magically *poof* a bottle of each into everyone's medicine cabinet.
Ear candling is also good :)
'Hope that gives you enough information to give him some relief :)