hmm, touching close to the wire there!
Yes, I can see how playing leisure sports in the holodeck, and then when you perspire, the sweat shaking off you onto another character in there, or the scenery, then when it is switched off it should fall to the floor? To thoroughly clean the room, they would need to use detergents, and those would need to have no smell to avoid the room smelling of cleaner when successive people enter it. The last thing you want to be smelling in a waterfall scene in the tropics is "alpine fresh".
I think we can make a comparison to our current ISS and how they manage excess sweat, skin and other particles. Do the new crews open the airlock whilst holding their noses? And going back to your original point, the water reclamation/drinking system on board the ISS needs thinking about, as in what exactly is getting into it. Or maybe we should avoid nightmares and never,ever, look into how waste reclamation works
