I have had black Dakota in my 1er for 5 years.. I keep the car immaculate but I have only ever used a normal APC on the seats. To be fair I don't do a lot of miles, and the kids rarely get in.. so its not often dirty... or what I find works well on the BMW interior and seats is the pot of matt wipes from Halfords (white pot, yellow lid cant recall the make).
I do have some meguaires leather treatment that I bought when I got the car, but I have never opened it.
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