Disgusting .. How long does the SMELL of DEAD MOUSE take to go? Tips for eradicating....???

[cookiemonstress]

Hi
Last year we had minor mouse problem . This winter all seems to be ok but next door (terraced) still have a problem and are doing lots of building work. Anyway I have a smell coming from under the floorboards, under my kitchen cupboards which I am certain is dead mouse.It's very localised which is the only thing in its favour. I can't access the floorboards to rip them up (aside from ripping out kitchen cupboards) so I don't know what to do.. It's awful. I have best friend coming to stay for 3 days who is 12 weeks pregnant and nauseaous and DD1 birthday party on Friday. What to do??!
Need to go and anti bac and shower just typing this post.!

[MorrisZapp]

Also, I found air fresheners made it worse. I opened windows and burned incense sticks. My mum calls them joss sticks.