In the United States, I know that paper and plastic are often not recyclable if they are greasy.
Can I recycle metal that has vegetable grease on it surface? I'm thinking of canisters that once contained nuts.
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Scrap metals are not cleaned, they are melted. For steel; Zn, Sn, Pb, and others vaporize or oxidize. The most problematic is Zn as the oxide in the slag can deteriorate the refractory. Aluminum is similar except scrap aluminum containing Cu and Si will be segregated as much as possible, used for certain alloys. Copper scrap, being more valuable is separated according to the alloy to be produced. Oil, grease and paint are non-factors.
Scrap yards do not accept PCBs, TVs, anything made by a railroad company, sewer covers, or equipment containing Freon. Basically other than that: weigh in, dump it, weigh out, and get paid.
Oil or grease? If you dug up some soil at a scrap yard you could make brownies.... They have water trucks to keep the dust down, but everything there is just so yucky that it doesn't really mater.