I think I've finally found a good fix for out-of-control climbing shoe stank...and I shall be sharing it with you this evening!
The main difference I found with this fix is that it didn't just surface-treat the offending nasties, it got down and dirty with them, cage-match style. It resulted in the shoes being odour-free and taking a while to re-ordourise - not as long as a new pair of shoes, but much longer than any of the other treatments that I've tried.
Exciting stuff, stay tuned!