I have got hold of a Messager French 70's cotton tent, plan is to use the material which is egyptian cotton, earth brown, and water just runs off, to make a windproof smock(well my mate's girlfriend is). The trouble is as its so old and been in storage for so long, it has managed to take on the smell of old webbing(the smell you got in a army surplus store of the time).Would washing it in say nix wax wash then reproof be ok for tent cloth, or airing it for a fare while outside be a better option?