When it comes to hard to reach areas I like to get some cotton swabs and spray a little bit of APC on the tip and then try and get the wax off by agitating the residue with the swab until it's removed. If it's in one of those seals like you have pictured and the cotton swab method didn't work then I do the same but with a tooth brush.
I have some of the foam-tipped detailing sticks and the special detailing 'q tips', but often find a MF towel wrapped around a craft stick (fancy name for a popsicle stick) works the best.
You may want to try a spray wax instead of APC. Both will help remove old wax, but APC will also remove new wax...
When I go to the dentist, they always give out toothbrush samples. I always ask for the super-soft ones and find they work great for cleaning that stuff out.