2. I was able to get the foam covering the mike on the David Clarks to
clean
it , but can I get the mike itself wet to clean it? Will it damage it in
any
way?

In theory, nothing in an electret microphone will be damaged by water *when
the power is off*. The headset manuals that I've seen recommend wiping with
a damp cloth - they warn against immersing the microphone in water, the
primary concern being corrosion from residual water. I would start with a
cloth dampened with rubbing (isopropyl) alcohol. It will clean better than
water, evaporate faster, and won't leave behind any residual salt. If
necessary, there's no reason why you can't dunk the whole mike in alcohol -
though you might want to save that as a last resort.

Whatever you do, the key is to be absolutely sure that the mike is dry
before plugging it in. Leave the headset in a dry, well ventilated area.
To be safe, leave it for at least 24 hours - longer if you get it extra wet.

Disclaimer: I've never actually done any of this before - so don't come
after me if my recommendations cause your headset to spontaneously combust.

- Ray