How to clean a leather couch?

I heard lemon juice works wonders.
Mix lemon juice with cream of tartar to a past (equal parts). rub the past in, let sit for a few hours, work some more paste into the leather and wipe clean. Make sure you try this in a not so visible area first...

I also heard rubbing alcohol works wonders, but maybe it'll make the leather less pleasant to touch late, so again, I'd check in a discreet corner first. 

My neighbor has white leather furniture she purchased about ten years ago. She applies POND'S Facial Cream twice a year and her furniture looks as beautiful as the day she bought. She tells me that no leather can be as sensitive as her own face. On that advice we bought leather furniure two years ago and have also applied POND's twice a year and are fully satisfied.

Poop it. Nice.

I also have a white leather couch + dogs!!! An excellent cleaner to use is baby wipes, they not only clean really well but feed the leather with the oil they are impregnated with.