yep, i have to clean my morettes pretty much every couple of days at this time of year - i think the fact that the lenses are sunk into the plastic surround doesn't help - the air can't cleanly flow over the lights and you get a pocket which just fills up with dirt.
but i agree, when they are dirty, its as if the lights aren't even on. can't see the beam on the road surface in front of the car at all
