Stench coming from audio-cables

Can't really find any useful info concerning this topic so I'm hoping some of you might have some experience with this because I can't seem to find a solution.

I have DAP audio cables (XLR to jack, xlr to rca, splitters, mergers, etcetera) and most of them are giving off an incredible stench. It's not only the cables as I have an iPhone sleeve with a wide-angle lens fitted to it which gives off the smell just as bad. It's actually to the point where it get physically ill from smelling it (it makes me nauseous) and I'm starting to feel I can't justify bringing the bag to public places such as trains or busses.

Does anyone have a solution? I'm afraid that if I'd replace all cables (which would be an expensive joke) the stench will probably come back again. Can I was the cables? I have tried a spray you use for smelly shoes etcetera, sadly to no avail...