I have full Ivory interior on my X5, and I was hesitant about care. Not only is the Ivory fairly forgiving for "white" leather but it cleans up easily, provided you keep up with occasional maintenance.
I had Ivory on my F01 750i and did the whole leather cleaner and conditioner routine on that. IMHO not necessary more than once a year.
Given, I don't have kids wrecking my interior, but I also don't take special precautions like some people do with the interior. I never understood why people put down towels to drive their car. I bought leather seats, I want to sit on them.
For occasional or bi-weekly maintenance on the X5 I keep Sonax Leather Wipes in the door pocket. Use a couple of those on the leather surfaces and see the dirt they pick up. Plus they condition as well, so I do that before parking the car for the night to let it absorb, and then the interior is nice and fresh in the morning.
Here's the product I'm talking about (not sure where to get it in the US, but I order it off Amazon over here in Germany):