That is one of the hardest things to get out of porus vinyl. I would suggest 303 cleaner, a soft brush, and if that does not work, OOPS! Be aware, that the Methyl Ethyl Ketone in OOPS! can discolor the vinyl. Test a hidden section first. Above all, do not let it bake into the cushion in the sun and heat. If you get my way, I do have near me a couple of great vinyl repair shops that can resurface it.
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