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I dunno if you can get it all over the world but I swear by this stuff called Gran's Remedy. It's kinda like talcum powder, you throw a bunch in your liners and shake it up and it kills off all the nasty bacterial shit that makes your boots stink.
Otherwise... just make sure you dry them REALLY well. Try your local shoe shop. But it may also be that you have some nasty shit going on foot-wise - do your normal shoes stink it up too?
Last of all... what kind of socks are you wearing? A good pair of proper wool socks (Merino for the win...) go a long way too.