Ok, so I just got my second replacement Droid yesterday due to the ear speakers blowing out. I'm curious as to how many other people have had this issue. The call sound quality is excellent on the Droid, best sounding phone I've ever owned. However, over time it just gets worse and worse to the point that I've had to resort to the speaker phone to make and receive calls. This being my third and hopefully last phone, I want to do whatever I can to make the speaker last. Is it dirt and grime build up from being in your pocket that causes this? How can you clean it?