Removing Jeyes Fluid Smell

[walman]

In trying to cover up one smell with another (dead something mouse/rat) I poured a small amount of Jeyes fluid (neat) into a cavity wall space.
It is on concrete block and into a wooden joist and BOY DOES IT SMELL.

Not really a surprise that it smells more the fact that it has been there weeks and still no perceptible loss of stink.

We have tried painting over it and washing with water but no joy.

Any ideas?

Jeyes people told my wife we may have to remove the block and the wood - what is the half life on this stuff?? Milleinnia?!?

Any useful ideas welcome :(