Thanks for letting us know, Dave! I am gonna do this to mine just to see if it'll clean it up a little, even though my volume isn't bad. It'll be a good thing to know to recommend to people.
EDIT: I just did this out of curiosity. I used the toothbrush for close to 5 minutes before everything came out, both on the headset part and the speaker holes in the back. My notification light is about 3 times brighter now. I'm pretty sure it'll actually be visible in sunlight. It's great. Thanks for the recommendation.
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