Clean this mold (?) from my front loading Samsung washing machine

Samsung WF42H5200AW 27 Inch 4.2 cu. ft. Front Load Washer with Steam Wash, NSF Certified, Self Clean+, Allergen Cycle, Sanitize Cycle, 9 Wash Cycles, Vibration Reduction Technology, Smart Care and ENERGY STAR Certified: White

Build up on rubber gasket of washing machine. It's been like this

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