Super silly question, apologies. We have been very kindly given a snuzpod hand me down from friends. We've bought a new mattress and mattress protector but I'm wondering if I need to wash the fabric outer bit of the snuzpod? It's come from a very clean, non smoking household and was stored in a bag in the loft prior to us getting it. I'm concerned if I try to dismantle it to wash then I'll wreck it...?