Rat piss is like the taxman, once they get in they are hard to get out.
http://wildliferemovalusa.com/rat-urine.html
http://www.animalplanet.com/tv-shows/infested/lists/2-all-rat-urine-is-toxic/
Odarid only treats rat piss to some degree as generally the piss has been soaking for months or even years into rafter beams.
A good product to treat it is our Odour Bag.
This can be chucked in the ceiling or where ever the rodent has peed and just leave it for the minerals in the bag to soak up.
No chemicals.
Or even if you can't get a dead rodent carcass out, just chuck the bag in beside it.
You can thanks me later :)