At the end of each game session clean up the play area, regardless of whether the game is played in a student lounge or at a player’s home. Toss out food and drink containers (don’t make the host responsible for returning empty beverage containers). Sweep up any mess. Offer to help put away excess chairs, books, tables, miniatures, etc. Failure to do so may result in your having to find another place to play next time.
From 2nd Edition, AD&D's Campaign Sourcebook...
Rick’s Notes: Yeah, some of these snippets of advice on gaming etiquette sound obvious, perhaps even redundant, still, manners makes the gamer, eh?