Best Coffee Makers for 2025 Why does coffee stain your cups and mugs? It's so frustrating to run your cups and mugs through the dishwater only to find they're still stained at the end of the cycle.

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Thanks to Ninja, I can now enjoy my morning caffeine fix in a heatwave without sipping a scalding cup of coffee. Having previously tested Ninja’s Sip Perfect coffee mug, designed to keep drinks ...

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See at Cnet Why does coffee stain your cups and mugs? It's so frustrating to run your cups and mugs through the dishwater only to find they're still stained at the end of the cycle.