How to tell someone how yucky their bathroom was....

[tulip]

Yuck-o! I've had that experience, but luckily there was cleaner in the bathroom, so I just cleaned it. It was a rarely used bathroom so I think the host just didn't know.

Does your friend use that shower? Maybe she just doesn't know because she expects her grown kids to take on that responsibility and they are not doing it but she assumes they are. Maybe you could talk to the daughter and say something like, "you're old enough to clean your own shower. Surely you don't expect your mom to clean it for you. It was not acceptable and I thought you should know because that's a responsibility that you will need to take when you get your own place." Could get back to mom, though.

Maybe there's some parent-kid power struggle and mom's on strike and the kids are bozos. It happens.

Maybe your friend is having vision problems. I suspected as much about my own mother when I saw her shower, and it turned out to be true. Her tiles are earth-toned and she could not see the mold because her vision was getting bad.

EDIT: While I was writing this tome, a bunch of people said to just let it go. Sounds like maybe it's the best plan, unless you think something bigger is amiss.

EDIT2: Not sure I'd want to be sitting in her hot tub...