Cat smell can sometimes "stick" to both clothing and furniture. There is an incredibly effective spray for this called Urine Off. Don't be fooled by the name - this spray is incredibly effective both on stains and unpleasant smells on everything from soft to hard surfaces. A 100% biological product that is very effective.
For example, if you have a stubborn old stain that does not want to go away - spray on the stain and cover with plastic wrap and let it work for 6-8 hours. Remove the plastic and allow to air dry.
If the stain has not disappeared then repeat the process.
When sprayed on it smells faintly of lemon, but this scent disappears when the spray has dried. A spray that will save your furniture from impurities and smelly odors!