Ooooh, Good luck!!! Hope all goes well
A thought, pee runs off bingbags
Old newspaper and a bin-bag to chuck it into later ?
Ive just used diluted biological washing liquid to wash/scrub-down a path that had fox poop all over it, plus cleaned an area by the main front door where a roaming tom cat had left his calling card
It really does seem to shift smells (It also worked when someone threw up in the back of my friends car ....
)