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Gray residue on sheet pans/garlic press

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I have a couple of jelly roll sheet pans and a Zyliss garlic press that are about 10-15 years-old and, after I wash them, I get a gray residue on the sponge when I wash them and on the towel when I'm drying them. I don't know what's causing this and I'm concerned that it may be harmful to continue to use them. I've never put them in the dishwasher and I only use Dawn dish detergent to wash them. Any CHer's know what might be causing this and whether, or not, I should continue using them?

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  1. Not an expert by any means, but my guess is they're made from/with aluminum.

    As to whether it's a signifcant health issue . . . there's some controversy.

    1. I think that is just oxidized aluminum. No big deal. Oxidized aluminum is not harmful.