I was just doing a clients headliner in his smart car convertible. It has a super porous headliner (with all those small holes in it) that sits detached from the roof. I had luck steaming out the lighter grease stains but the large ones simply would no budge at all. I was using a Dupray Hill steamer so very strong. Is it possible to remove black grease stains from this kind of material at all?
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