I test a lot of espresso machines, but the new KitchenAid KF4 has one of the smartest features I've ever seen — and it'll stop your coffee maker from getting gross

Automatic coffee makers are a brilliant time-saver, preparing your favorite latte or lungo at the press of a button, and handling all the grinding, brewing, and steaming while you get on with making your breakfast, styling your hair, or just chilling on the sofa for a couple of minutes. Unfortunately, you can easily lose that time later on when the machine needs cleaning.

Handling the whole coffee-making process inside a plastic box seems like a great idea (out of sight, out of mind), but the heat, moisture, and organic matter (i.e., coffee grounds) make the dark, steamy interior of your espresso machine an ideal breeding ground for bacteria and mold.

Got a strong stomach? Here's what an unloved, unwashed brew unit will eventually look like, courtesy of the aptly-named subreddit r/MoldlyInteresting. "Heirloom culture fermented brew," observed one Redditor. "Aged in the dark. Price per cup: $35.00 USD."

It doesn't...

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