I have had good luck with odors using ozone. I bought a cheap one on E
bay and bought one from a pool supply made by prozone. Anyway I
originally used it to remove natural gas and other hydrocarbons from
water. It oxidizes them out of the water. In your situation I would
use ozone and strong surfactant to remove the smell and do just like
you read on a shampoo bottle, lather rinse and repeat. Do a little
homework on ozone it is good stuff and more powerful than chlorine as
an oxidzer.

Scott in Texas