In America yes, people wash in wee and even use it on their wounds. They are the antivaxx crowd, typically
About the wee thing...many years ago my friend had an accident, got hit by a car on a crossing, thankfully survived, bit obviously had quite serious injuries. She hit the tarmac with the side of her face, quite a lot of damage to the skin etc. As she was recovering, her grandmother advised to use her own wee (friend's, not grandmothers!) twice a day on the scars that were forming. She did it every day for many months. You can't see any evidence of that accident on her face, absolutely incredible. They are not anti-vaxxers, her grandma was simply from a generation that knew and used a lot of natural remedies. This particular one worked a treat.
ETA: it was in Europe, not the US
ETA2: forgot to add that many creams for treating scars and various skin problems actually contain urine.