I'm working in my little shed/shop building a few things and i guess the wind was just right and I got a whiff of something. Turns out its from the rats pissing behind the shed. I put down pallets and covered the entire area with OSB to get everything of the ground. Worked really well. It didn't occur to me when I put the floor setup in it would become a hotel for rats. I finished removing all the pallets and osb today. I can still smell rat piss, but no where near as strong as it was. I'm going to put concrete pavers down for another floor. I want to get rid of the faint smell before doing the pavers. Anybody got a solution?