how can I remove smell of wee from leather sofa?

[waitingforgodot]

DS had an accident and it now stinks despite me sponging it down with fairy liquid soapy water. Any tips?

neat tea tree oil (has worked on mattress, sofa, carpet)

sorry, didn't notice you said leather...I would probably test on a small patch on back of sofa first.

thanks! where can I buy that?

a health shop for a good one. chemists/supermarkets will do lesser quality/less pure brands.

thanks!