i was wondering if anyone has had to clean up some old, kind of large spots of what has to be rat urine off of old concrete. it is in an older extra large 2 car garage, if you zoom in you can maybe see the stains. it looks kind of shiny at this point,, but i think it is pretty old,, no fresh signs of rats in a while. the spot is much bigger now,, i know it looks like pellets of rat poop,, but it goes beyond that now.





