It's the old grease or blood debate...Let's skip it and agree each substance lacks charm and poses difficulties for contract cleaners. Here, the focus is grease. It's a fire hazard in kitchens (on surfaces and in ductwork). It's a health and safety issue (slippery when not wet); everywhere it covers a substrate. In the strict sense, grease derives directly from animal fat. But generically, grease is used to refer to lubricants, and removing it is a challenge whether it has an immediate organic source(animal fat, plant oil) or originates from a petroleum product or synthetic.
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