You should be able to right-click the intel briefcase (prop_static or whatever it is, might be a prop_detail since it spins) and choose 'world model' from the list, then search for mop.
Might be odd to steal a teams mop and bucket though :w00t:
I'm sure there will also be weird happenings like the mop handle either sticking through the player who grabs it or sticking 5 feet out behind them. Depends on the attachment bone I guess.
(youme is not gonna like this idea
)