Ugh, the stone leather seats in the Explorer have been a major point of stress since day-1.
We had a dye-transfer stain on the side of the passenger seat that I believe occurred at the dealer when the car was being prepped. Tho admitting no fault, the dealer offered to have the stained area re-dyed. The re-dye initially looked fine but did not last even a month. The stain bled back thru.
Ultimately I was able to clean the stain off myself but not without slightly darkening the the leather in the process. (A casual observer would never notice the change, and it is certainly much better than a dingy blue stain)
All of this lead me to research and try several leather products. Here is what I ended up with.
I like Zaino car care products, so I have their Z9 and Z10 leather products. Z9 is a gentile cleaner with no harsh chemicals and some oils to preserve the softness of the leather. Z9 will *not* remove a dye transfer stain, but is gentle enough for routine cleaning. Follow it up with Z10 conditioner. Z10 smells like leather and not only contains conditioners and preservatives but also has UV protection. Z10 can also be used on the interior plastics. On plastic, Z10 looks natural, not glossy, and the plastics benefit from the UV protection too.
When it came to tackling the dye transfer stain I used Leather Master products. Leather Master has a "Strong" cleaner and a "Super" cleaner. The Strong cleaner lifted some, but not all, of the stain. The Super cleaner got it all out, but don't ever use Super to clean a whole seat. It is a product of last resort. It's more akin to paint thinner than soap.
Since the Super cleaner is pretty harsh stuff, I re-treated the cleaned area, and any areas that would come in contact with clothing, with Leather Master "Protection Cream". This product creates an invisible stain barrier to prevent stains from absorbing into the leather. Tho indiscernible to the eye, the Protection Cream does slightly alter the "slipperiness" of the leather seat. It's not sticky, I just feel there is more friction between your clothes and the leather seat than before.