I know I am late to the game, but another way to clean suede and Alcantra leather is by use of a steamer. Not the cheap small handheld steamer, but a more professional steamer, like those used in tuxedo shops, that steam jackets and pants. I use one at home and in my 370z with Alcantra seats, and it works wonders. You may hear that is does not clean, but if you wrap a MF towel around the head and gently go over your seats, you will see all the oils and grim it lifts. Then use a horse hair brush it out and it will look new.