I can imagine that it sounded funny to you, but I spent a year or so on the urine forum and indeed for that time I used urine for a rinse and it worked well. I had forgotten about it but I might try it again. It is certainly cheap.
To understand urine you really have to read about it because most have that ick reaction.
In my CZ life I have tried at least 15 different forums and I have learned something from all of them. And now I am here too and I am still learning more.