As a former teenage boy, sometimes it’s really just soap and soap scum and dirt and whatever else caught in the hair rather than anything else.
Also, for anyone caught in a sticky situation, cold water to keep the proteins from denaturing and getting sticky in the first place, and if all else fails use shampoo to try to emulsify it to stick to the water instead of the floor, to make little sewer babies with your neighbors.
How do you see this change impacting the overall experience? When you say that the single player mentality is ruining MMOs, what features or gameplay decisions are you picturing?