I'd add to Otto's remarks that no one is the least bit interested in hygiene on board except the crew and pax. Enforcement is impossible, the CAA say they're an aviation authority not a public health body, the council say talk to the CAA. Even if the council was interested (they do not consider aircraft to be part of their remit) how do you suppose they'd get airside without IDs? No way! I have been involved in efforts to get squalid flight-decks cleaned up and no-one, but no-one is able to do a thing. The only help you'll get is from the crew on the day. Or the media.
And remember - some filthy bastards even change their filthy babies on the tray tables...perhaps Howard Hughes was onto something after all!