How do you remove human urine from a leather sofa?

If it has stuffing, and not foam, then take it outside, take the stuffing out. Then you scrub water into the leather. Not just on the pee, but all over it, bottom, top, all sides. Then let it sit in the sun until it is hot and dry. If there is still a smell of pee then repeat until it is gone with "Natures Miricle" which is found at most pet stores.