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How to clean a cast iron stove
Place an old newspaper on the ground in front of the stove.
Do this as a protective measure before you begin scooping ashes out of the stove, as they are liable to drop onto the ground. A newspaper will make cleanup much easier.
As you're spreading the newspaper, open the air dampener so that any ash stuck to it will fall into the firebox. The air dampener will be a small knob on the front of the cast iron stove, that you should pull outward to open.