[Arran]

Since you are using a water based solution anyhow try some TSP from a paint store and hot water. That stuff will take the smell out of just about anything. About two tablespoons in a gallon of water should do, along with scrubbing and a rinse. I didn't mention it because there is a chance that the water may dissolve some of the glue and cause some delamination. The inside of the cabinet should be sealed with something anyhow so hopefully the rat pee didn't soak in too much. It's too bad that you can't find someone who can dry ice blast the inside of the cabinet, it will take a small amount of wood off but it obviously won't cause delamination.
Regards
Arran