How should I clean the exterior stainless steel finish?
Use nonabrasive cleaners like hot water and detergent or Formula 409, and rinse and dry immediately. For hard water spots, use household white vinegar. Rub lightly in the direction of the polish lines. Avoid using cleaners containing chlorine as it is corrosive to stainless steel.
From the official Bosch NGT/NGP Gas Cooktop manual, page 14
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