Sticky tape or glue deposits left on the stainless steel surfaces during the manufacturing process are often mistaken for scratches. To remove any glue residue, simply apply a coating of cooking oil to the mark and allow it to sit for 10 minutes to an hour. Rub the surface with a soft cloth to gently remove the glue from the stainless steel. For stubborn stains, try WD 40, rubbing alcohol or vodka. Let it fully permeate the unwanted residue, then rub away with a cloth. You might want to test on a less visible spot as some products may cause the damage to the surface of your grill.
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If there are tough greasy stains or grime, try using undiluted vinegar, then wipe down with plain water. If grease and oil spots persist, you may need to use a stronger grease cutting cleaner.