First of all, the notice board is a very useful/fun tool. But it's kind of a pain to recreate new pristine parchment for every little message and also get rid of the old ones. It would be neat if right clicking the parchment on a water container would allow it to return to it's virgin state ready to be reused. Alternatively maybe reduce it's quality every wash until it can't be recycled anymore.
Maybe it's not super realistic but it would be mighty convenient.