Mouse smell

[chazza]

We recently found out that a mouse had been in the cupboard under our sink (cleaning cupboard but it was after birdseed that was also in there). We've cleaned and disinfected everything and cleaned under the kickboards, but there is still a bit of a pee smell, we think it has maybe soaked into the concrete floor under the cupboard

How could we get rid of this smell rather than just masking it?