Airsupport, it seems that you have never seen a coffee or tea plunger let alone tried to clean one. The cabin crew must work with what they are given. You may have seen coffee grounds in drains on Viscounts but jumping to the conclusion that they are being put there when there is another reasonable explanation for them ending up there is not helpful.
Jabawocky, I agree that that would be an excellent way to remove one problem from the equation
Obira