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What is this grey residue inside my stainless steel canisters?

Asked by mistic84 (274points) October 29th, 2010

I recently bought some new stainless steel canisters to store loose tea leaves in. I washed it and then dried it out with a paper towel. I looked at the paper towel and sponge and noticed some grey residue. What is it and how do I get rid of it?

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