Isn't it the same as soaking the pots/pans in water for a few days to get off hard baked on whatever its called? I've been known to soak pots/pans for a few days and it then just wipes off with a scourer. I suppose piss might work, after all it is a liquid.
I piss in a 1.25L bottle in the shed, when it is full add that contents to a 9L watering can and then fill the remainder with water and give a few areas of the lawn a water. Does wonders to the Blue Couch
