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Why do pots get dirty on the outside?

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OK, I understand why there can be a bit of soot from the flame but why would the outside of pots have those brown stains that you get inside a pot from oil? Can it be from grease somewhere in the burner? I notice it on my A-C and LC. One of the great mysteries of life...LOL!

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  1. Airborne fat in steam. Just like the inside of your oven. On LC I give it an overnight bath with oven cleaner once or twice a year. Do NOT try this on aluminum. It will ruin it.

    1. A little fat that spatters from a neighboring pot and then bakes on?

      1. Our grubby, grubby fingers.