Black marks come off my window or rubbing strake rubbers.
Window Rubber Surrounds and the Rubbing Strake rubber respond to feeding!
Gently rubbing in a rubber care solution keeps them supple and helps to stop the UV from the sunlight breaking them up. Simply wipe around with a rag to bring back the shine. Eventually of course the rubbers have to be replaced, which is the case when black marks are constantly rubbing off onto your fingers or clothing.
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