I always try to be proactive when it comes to items like this. The name brand tire/rubber cleaning products are no scrub/no touch whatsoever, it's unreal how much grime and dirt comes off them, when they dry they are ultra flat black and unprotected, the Maguires Endurance makes them ultra gloss black and protects (no sling formula keeps it on). I hit the sway bar and subframe bushings too. Of course the black plasitc body panels/trim/tires/air vents get the treatment twice a year.

I'm 2nd owner, found 1st owners business card in glovebox, called and got history.

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!