Take them apart and clean out the bug parts. Of course, be careful, but you can probably brush away the big chunks pretty easily. Then you might gently vacuum any smaller debris that has fallen in behind the phase plug and between that and the diaphragm. Be careful not to put a sealed vacuum against something that would bring full vacuum pressure on the diaphragm. Let it be "leaky" rather than sealed to the throat. You could rip the diaphragm if your vacuum were strong enough and you sealed it tightly to the throat.

I guess that was really buggin' you, huh?

You had some bugs in your system to work out.

Really buggers up the music when you're playin' it loud, huh?

OK, ok. I'll stop.