Leather Master 3 step restoration/protection is likely the best there is. I've used it for years. They really know leather care.
https://leatherworldtech.com/leather...r-care-bundle/
I use these brushes on my seats with the leather cleaner. The combo really pulls the dirt out of the leather.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1