Oh, no. Pee.
The ONLY thing, IMO, that removes the scent of urine is OdorXit. I buy that stuff by the gallon, and would never buy anything else. I had some cat, and I suspect it was Minnie, pee on my bed. Someone else peed on my couch. I suspect that was the RB Georgie, and it was from Monte's stalking. Both scents were removed completely.

I regularly wash the rug under the litter box in OdorXit. This thing has lots of pee on it. No odor after the wash.

I hope Scout's condition checks out okay. Stones certainly CAN become difficult, more so in the boy cats than the females. Good luck.