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You can use petrol on a rag. That is ok.
I'm not sure about the methylated spirits (denatured alcohol?), but cannot see why they wouldn't work as well. At least with the knife and razor blades, but...

WD40 works ok, but to remove real sticky stuff from metal (razor blade, for example) diesel fuel oil and kerosine work really well. I've used those to remove bunker fuel/residual fuel oil stains from...