Cleaning / Removing the Speaker:

After removing the rear chassis you will see a box at the top of the phone. (Image 1) Remove this by using a spudger to pry the clips on the outside of the chassis away from the speaker housing. Once the top and right clips are loosened you can pry the housing out from the bottom.

In image 3 I have removed the mesh from the chassis. This allows me to use canned air or alcohol to clean the speaker holes. Let it dry and replace the mesh cover. The housing should snap back in when inserted top of case to bottom.