You might want to look around back and see if you can spray some brake cleaner from the behind to clean them off a little. Hopefully the balancing will take care of the problem. 
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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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