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Avoid eating/drinking/animals in the car and with some normal maintenance, you'll be fine.
For the record, I think Lexus went with black carpets with the beige interior starting in 2009.
I have all black and it's pretty simple to keep clean. I don't find it too hot in the summer either, but I agree it's a little played out now. If Lexus offered a brown or red interior option like Audi/BMW, I'd be all over that. Times and styles have changed and that's where the newer trends are.