blot as much urine up as you can- if it's still wet (doesn't matter) mix vinegar & water in a spray bottle (40/60 or any strong combo will do)- soak entire area. let sit a while then coat with baking soda- let sit again. scrub with hand brush- take up with paper towels.
Hernia mesh is a product which is used in hernia repair. It is made from implant-grade plastics which are formed into a grid which can be used at the site of a hernia to hold herniated organs in place and provide a lattice for new tissue to grow on, effecting a long term repair at the site.
Wire mesh in slab on grade is done wrong more times than done right. Wire mesh is not classified as reinforcing in most cases. It is a binder per se. Whether mesh is used on grade or in what is called a composite slab (meaning concrete poured on corrugated metal decking), it is the supporting substrate that makes or breaks the slab. I'm not making excuses, the wire should have been pulled as it was poured, a lot.