Faded doorcards

Got a slight issue with my MGF. The door cards have faded from black to a sort of grey colour.



I've tried to revive them by giving them a good wash then using some dashboard cleaner on them (a Simonez one). When I first spray the cleaner on, then wipe it off they look great. But once they dry, they are back to dull grey :(



Any ideas on products that could improve the look? Thanks :)

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