Porterfield Brake Shoes for 2000 GMC K2500 4WD 13" Rear Shoe Compound:R4-S Do I need to clean

Do I need to clean the header flange before installing this gasket

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Porterfield Brake Shoes for 2000 GMC K2500 4WD 13" Rear Shoe Compound:R4-S Do I need to cleanPorterfield Brake Shoes for 2000 GMC K2500 4WD 13" Rear Shoe Porterfield R4 Porterfield R4 Carbon Kevlar based brake pads were fully designed for heavy duty extreme motorsports use. Its one of the the few true motorsports competition pads available on the market today. The carbon based semi metallic R4 brake material allows the brake pad to absorb huge amounts of heat and dissipate it quickly and evenly over time. The Carbon Kevlar material also