True to my character, my nesting instinct has taken over at exactly 6 months pregnant. We went last weekend and bought new flooring for the basement rec room and started ripping out the carpet down there as soon as we were home. It had to be replaced eventually but this was a little sooner than we were planning, thanks to the cats. We suspect there was a cat (or 2) who lived here back in the day who used to pee on one spot in the corner. It was an issue when we first moved here, I did an enzyme treatment on that area and the cats ignored it after that and went back to using the litter boxes. Recently, when we've returned from a weekend away, we've found poo in another area of the rec room and once there's been pee there, too. I will not allow the kids to play in a space that isn't clean so the rec room has been off limits for the boys for weeks. We finally pulled the trigger and decided to do something about it.
Once the carpet was up, we saw that the underpad was all stuck to the subfloor because of the enzyme treatments we used (it was 3 litres of water we poured onto the carpet each time) so we had to work to scrape the crumbling underpad off. Then the subfloor underneath was damaged - and likely still had a bit of cat pee smell in it, though we couldn't smell it - so Craig replaced 2, 4X8 sheets of the plywood. It was a huge job and wouldn't you know it, the weekly garbage pick-up won't accept any of it so all that smelly old carpet is being stored in the garage until we arrange to bring it to the dump and pay a fee by weight to dispose of it. Lovely. Small sacrifices, I guess.