For the last six months, on and off, my 4-year-old daughter has had trouble hearing. Thinking it was a build up of ear wax, we ve tried using ear oil to soften and flush it out with salt water, which seems to work for my husband when he has that issue. This last time, my husband saw some white build-up deep in her ears that isn t seeming to come out. What could this be and could it be what s causing hearing issues?