A.Henri de Marne responds: For heavy buildups, use Speedy White Hearth and Stove Biodegradable Cleaner. If you can’t find it locally, call Speedy White at 800/872-8855 or write them at 871 Fairport Rd., East Rochester, NY 14445. This product will do a better job than 409 or Mr. Clean, which might be sufficient for light contamination.

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