Last one to post in this thread wins!

Fred Scigliano said

In the fire dept. we used sandwich bags filled with baking soda and tossed them in the stove or down the chimney. Worked well and not as messy.

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Thanks for the tip. Hopefully I’ll never have to find out. Being a residential bricklayer I inspected quite a few masonry chimney after a fire not one was in my opinion useable. The liners can take the heat but the rapid cooling during when the fire is put out cracks them. Steel chimney not much better the heat warps the crap out of them. Best just use mirror trick and keep it clean.