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I use Autoglym resin polish if a wipe with undiluted Fenwicks doesn’t work.Got some black streaks on front of van above cab doors have used fenwicks remover but can still see them , is there anything better at getting rid of them .
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This product is unsafe to use on GRP, it's designed to penetrate stone, wood & brickwork. It eats gel coat.Jennychem Black Spot Remover.
Was recommended on here and as the supplier is near me in Kent I gave it a try.
Absolutely brilliant, removes black streaks and blackness along the seams with practically no effort at all
Put Jennychem in the search box above and find looooads of reviews.