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You can clean darkened aluminum pans when doing kitchen cleaning easily by pouring in two teaspoons cream of tartar mixed in a quart of water. Place on stovetop and boil for 10 minutes. Get high quality cookware and avoid issues like these.
You don't actually need the cream of tartar. You just need to boil a tiny amount of water in the pan for about 5 minutes (I'm assuming you mean stainless steel pans, since they don't make aluminum ones?).