Need help with urine smell, can't figure it out
We recently moved into a home and one of the bathrooms has a strong urine smell. I removed the wallpaper because I thought, hey maybe someone was peeing on the wall.
Scrubbed the bathroom. When we leave the window open and air it out, it is fine. Close the window and 5 minutes later smells like urine, almost a sweeter version (sounds gross, but it is the best description).
I am the only one that uses the bathroom and I don't pee on the floor.
What in the world can be causing such a permanent urine smell? What tests on the plumbing should I do?