Hello,
Have you spoken to them about it? I would take that step first: explain the situaton, and politely ask if they would we willing to cover some of the costs that you have incurred. You can collect money through the Request Money button.
If they are not receptive, you could contact Airbnb to get the money, but be prepared that you will need to provide lots of documentation to prove that extra cleaning was required. If you plan on going this route, I would make sure that you are documenting everything that happened through the Airbnb messenger rather than discussing the issue verbally with your guest. Also make sure you have pictures.
Good luck! Hopefully it all works out.
Alexandra