On Wednesday, 17 August 2016 17:35:33 UTC+1, Tim+ wrote:
In my experience, machine washing running shoes with conventional
detergents does something to the midsole material which makes them stink of
cat pee (and I really mean *stink*) every time they get damp or sweaty
thereafter.

That happened to me too.

I just assumed it *was* cat pee and lived with it.

Owain