Cody, for the near term, spray flush and scrub with vinegar and then
Saiger’s Cide. It will control the urine smell marvelously. Don’t neglect the fixtures and floors, either or the heavy residues will still stink.
If it comes to refinishing the rusted panels, you have to flush, sand and then use phosphoric acid based rust remover like Naval Jelly or a converter like Stop to chemically alter the rust to an inert
compound. Paint with a rust inhibiting primer, then a chemical-resistant industrial enamel. I have used automobile paint but the set up, masking and ventilation is a frigging pain unless you take the panels to your shop.
For maintenance, have them use a spin mop from Walmart and neutral cleaner, with a slug of
Saiger’s Cide. There is no better, cheaper and faster combo.
Good luck!