One guy I really trust - does a lot of Porches, told me that for cleaning, plain Woolite diluted (10:1) works the best. Well, IMHO, he's right. I had tried Lexol, Megs , and 1Z. Now, for a little conditioning - zaino is good, but I heard DG is the same thing.....waiting on the storm!
i just used leather masters on a clients black nappa leather in his M3. It completely revived the entire interior and left a great leather smell. ive used leatherique on my m3 seats and i prefer LM. just my two cents