got up this morning in my living room i can smell human urine. there was a duvet laying on the sofa. the smell is coming from there. and now my sofa smells of urine as well... its a leather sofa i have no idea how to get the smell out. im quite angry because it was alot of money and i just dont want it smelling like piss. my kids have not done it and its happend after we have all gone to bed. only person i can think done it is my daughters boyfriend hes 18... i dont know how to approach it... or how to get rid of the pissy smell