You can blow/flush them out if you remove the pill.
A lot of these lights go through hand assembly, and not in clean rooms. So inevitably, some stuff might get into them once in a while.
I have a SureFire U2, that I surmise was assembled by a guy with a reddish brown beard. I know because a bit of reddish stubble wanders around the reflector as the light gets used. I don't have red hair. :thinking:
Aye! And I'd like me scruff back, ye scoundrel.