Hello fellow R hill M5 owner!
For leather car, I swear by leatherique products. I've been buying it for a couple of years now and OMG, unbeatable (IMO at least). There is a 2 stage (rejuvenator and cleaner) combo that works magic on drying or fading leather. I order from the guy in Niagara falls, great guy and the stuff comes fast!
As far as carpets, I've just paid a detailing shop 3-40$ to just clean them up with a wet vac, but I just bought a wet shop vac so will be using that from now on.
www.enthusiastauto.caContact if you are looking for a car
--2000 BMW ///M5 .:Jet Black on Black:. Individual - Style 65 Wheels; 9.5" Square Set up;275 Tires;10mm/3mm Spacers; Black Kidneys;Muffler Delete; 3.5" Dual Tips; Beast Power Sway Brackets; "Dinan" Ducts; E60 SSK; BC Coils
--2000 BMW ///M5 .:Avus Blue on Grey/Black:. '01 Exterior Upgrades; E60 SSK