Good luck getting the pee smell out. It will probably take more than one treatment of whatever you use. We have one cat that will pee on something if we leave overnight. So now we put down a sacroficial towel on the bathroom floor which she uses to let us know she is pissed off, then we throw it in the wash with bleach when we return. I'm thinking that the nylon won't absorb the liquid like cotton or some other fabrics so might be easier to neutralize the odor.