This sorta belongs in a thread about FA hygiene IMO.
While I'm not a germaphobe I do pay attention to people's hands around me. Particularly, those handling items that may wind up near my face and/or put in my mouth.
I've witnessed the full range from FA's - those that do wash hands with soap and for 20 seconds before beginning service to those that give it a mere rinse and those that merely forget or never wash their hands properly before cart service.
Yeah, I've seen the coffee pot into lav thing too and it made me uneasy. Particularly, if it contacts the toilet seat or parts thereof.
Maybe a gallon bucket with lid for liquid disposals? I'm sure it's a hassle but so is getting sick from seemingly avoidable behavior...............