Same question from me. Like an idiot, I drove 4 hours on the weekend wearing a brand new, never washed, pair of blue jeans. My ventilated caramel-colored seats now have a trace of blue. I never thought about this before because my previous cars had black leather seats. I worry that if I try some of the advice I read on this forum (high-quality cleaner and a leather scrub brush) that I will just change my seats to a swirly blue trace. I am also not sure what happens if the cleaner goes into the vent holes in the seats. I'm tempted to just leave it for a bit to see if it wears off.