I have the smallest ear canals that my Dr has seen. Ever since falling pregnant, I have had 1 ear constantly bloked.. I thought that it might have been a symptom of pregnancy. Obvisously not!!! He washed my ears out (not sure if it is the same as syringing), but now I can hear properly. I tried Waxsol and it did nothing for me excpet make a mess on my pillow at night time. I would suggest going to a Dr rather than doing it yourself.
Good Luck
ps... at least it is not selective hearing.