1. It could be a problem with a plumbing vent and sewer gases are getting into the bathroom. Maybe the toilet wax ring has failed?

2) The previous owners might have kept their cat litter box in this bathroom and made sure to air out the rooms before showings. Did you have rain recently or did it get more humid recently? If they had a cat that marked on the floor and walls, it is going to be really hard to get rid of.

3) What kind of plumber can't come for a month? Get a new one!

When cat urine has permeated into anything remotely porous, it’s going to be an expensive problem where everything has to be ripped out and replaced - it might be cheaper to burn the house down and start fresh with a new build (I’m only half joking here when I say burn the house down to save money! But dog pee smell is easier to remedy than cat pee, so if I had to choose one to deal with I’d pick the dog pee 100%).

Is there an exhaust fan in that bathroom? Like @kelli w, I’m wondering if it’s some kind of mold or bacterial growth. If your bathroom has no ventilation, things like mold/bacteria are definitely going to proliferate on any surface with the right combination of conditions that allow them to do so. Since it’s less costly to go without cleaning the shower and see if the smell worsens; if it does you have a starting point from which to plan a course of actions, which should definitely include putting in an exhaust fan if there’s not one in there already, but it’s only able to help things if it’s actually used during showers and run for a good while afterwards so it can do it’s job completely.

Floor is tile. Sewage gas seems sketchy. I'll try to get another plumber out asap. Apparently other owners didn't have a cat.

Any chance there is a cat living under the house? Or spraying on the outside of the house where the bathroom is?

Some kind of juniper shrub smells like cat pee too.

It's the drain! I have it too, but don't know what is causing it. Was looking for answers.

We had the same issue! All of a sudden our Clorox toilet cleaning products made everything smell like cat pee! The pucks that go in the back of the toilet and cleaning products that go in the toilet. But now wondering if there is a underlying deeper cause because it started when we moved into our new home.

So for months now we have had this same problem. We have lived in this house since 2007 and no cat has ever been upstairs in that bathroom. For the last two weeks the odor has gotten worse. It finally came to me that the bathroom never smelled like cat urine before my husband installed some shower doors. So long story short, we thought the smell was coming from the caulking, and it was but, the smell was coming from under the shower door track where water was going inside under the track through what I guess is called a drain hole in the track. When he pushed on the track the cloudy, milky white, stagnated, bubbly water bubbled up through the hole in the track. The pungient smell that smelled like cat urine reaked so bad it could be smelled down the stairs. Hopefully, all of you having this same problem will be find the cause to come from water under your shower track. If not, look for another source where water can be getting in and staying.

I moved into my boyfriends house a year ago (with my cat and dog) and a few months ago the master bath started smelling like cat urine. I thought for sure my cat was using the shower for a litter box! We started keeping the bathroom door closed and the smell got worse. Senona Tolly thank you for your comments! The smell is coming from the shower door track. So relieved to have found the source of the odor!

If there are boxwoods nearby the bathroom they give off a cat urine smell in the spring