Here's how I would do it:
~Post signs on the door, in the barn, pretty much everywhere saying "If you have stuff in the tack room, it MUST be put away by X date" (I'm assuming they have tack boxes/lockers, and aren't supposed to be leaving their crap out everywhere)
~On X date, there will be a tackroom/office/barn clean out party. Pizza will be ordered for people who are willing to help out. Someone will bring some speakers for an ipod, and you will have a party.
~Everything left over in the "I have no clue whose this is/what to do with this" pile will be put in a lost in found. New signs will replace the old signs saying that after Y date (about a week or so after the party) everything will be thrown out/donated. If something is yours, claim it now or forever hold your peace. On Y date, throw it out or donate everything.
While cleaning the tack room, have people in different battle stations. Have one group cleaning all tack/leather, and sorting out stuff that is no longer useable. Have another group cleaning and sorting brushes. Have one group in charge of washing and sorting saddle pads/girths/other fuzzy things. |