It is called "character" or "patina" in some circles. But if you must clean it off, get some citrus spray on cleaner, food safe and effective.
Blessings, 
Omar
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Webber 22 1/2 OTG Gold, UDS, rusted out chimney, Red Lavatools Thermowand, Maverick ET 732, 1950 model wife. Walking cane to help me get around.
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