How do I clean the igniters on the cooktop?
Carefully wipe the igniters with a cotton swab wet with water, ammonia, or Formula 409®, and gently scrape off soil with a toothpick. Avoid excess water on the igniter, as a damp igniter will prevent the burner from lighting. Remove any remaining lint after cleaning. (Page 15)
From the official Bosch NGT/NGP Gas Cooktop manual, page 15
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