Personally, I don't think they are worth the price. There are plenty of Porsche approved or recommended products out there to take care of the car.
What wheels do you have? Mine are the 17" sport wheels that are actually painted silver. They are easy to take care of and a little wax helps fight off the brake dust.
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1987 928S4 Silver Metallic (980)/Navy (TP) 5-Speed
2000 Boxster Speed Yellow/Black 5-Speed
1966 Wife White/Brown Top
1986 Daughter White/Brown Top (Sold!)
1992 Daughter White/Blonde Top
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