the best leather cleaner by far ive used was eagle one leather cleaner. i cant find it anymore but i used it on my tan leather and it was like id used bleach, it came out really clean. dont try painting because it will rub off the cow epidermis and stick to your levis. if you have rips, use the leather rip kit.
again, ive tried literaly dozens of leather cleaners.
best by far cleaner-----eagle one
best by far conditioner------tanners nature preserve.