Try examining HOMES.
My dear husband's bedroom bathroom STUNK of urine because he stands and I guess doesn't clean regularly. The room looked OK, if bit cluttered, but it smelled. Definitely. I've never smelled a home's bathroom like that.
I finally told him about it when he was setting up to sell his house for our marriage. Just common sense never mind I was afraid our (friend) real-estate agent would have the dubious embarrassing duty to tell him to "clean up the stink" to help sell.
We're dealing with the same problem...sort of. Just bought our dream home and realized that the master bath's toilet area is stained beyond repair with urine. On the wallpaper (!!!), the tile grout, etc. Bleach helped the grout, but not the wallpaper. It all has to come down. When we toured the house, we just didn't notice it. It's awful and I refuse to use that toilet - even at 3 in the morning. Funny, my husband isn't bothered by it at all.