I have this problem sometimes. Debrox works but I HATE using it so I almost never do. It just bugs me Go to the doctor and have them flush it. Or you can use the Debrox. I know some people are fine with it. But don't let the wax sit there because then your ear will get infected and that's REALLY painful! I had a bad ear infection a few years ago and I was in bed for 3 days
I currently use OTC products - which always does the trick for me.. However, if that failed, I would definitely see an ear doctor to rule out other problems and/or have my ears cleaned properly..
My dad was one of those people who had such a build up he would have to see a doctor because it was really starting to impair his hearing.. If it's just "routine" stuff, I think a good place to start is with the OTC products..