If you're thinking of washing it in the machine; I'd put it in a pillow case, or make a cloth bag big enough to hold it, cold cycle gentle, or hand wash it, no agitation; soak it in the tub even with the mildest soap you can find. Lay it flat to dry, depending on what kind of shape it's in, you'd want to maybe drape it over something, instead of hanging it.
Good luck