I was just reading an article about privacy information from a school being left out in the open at a paper recycling plant, for recycling instead of shredding. I thought all recycled paper was shredded before being recycled into new paper? Perhaps I misunderstand the process.
Anyway, a key to keeping paper recyclable is to keep it dry. If paper gets wet, just throw it away. When it gets wet, the individual fibers in paper shink. It is vital that the fibers are kept as lengthy as possible for recycling. When they get wet, it kind-of ruins them.
Hopefully, someone will figure out improved recycling technology that can reuse paper no matter how shrunken the fibers get. In the meantime, if you are serious about recycling, keep it dry and clean.