Depending on what needs to be cleaned off, for regular maitenance weekly I wipe the seats with a damp cloth just with distilled water (tap water is fine as well). I do the same for all the interior and dash. No crappy armour All or interior protectant on the interior. If you need to clean off a mild stain I would use Lexol PH balanced Leather Cleaner then follow up with Lexol Leather conditioner. The key is not to saturate the leather seats with the conditoner and apply it to the cloth not the seats. Wipe evenly over the seating surface. I have also used high end Pinnacle Leather Conditioner which is the consistency of yogurt and I had blotches all over the seats. I re-cleaned them with water a couple of times and the blotches disappeared. For tougher stains a good All Purpose Cleaner such as Poor Boy's APC diluted 3:1 works well. Just to be safe anything you use should be tested on a inconspicuous area first.

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2013 BMW X6M-current
2013 Audi S4-current
2007 BMW X5 4.8i (E70)-sold