Scratchy materials, including calcium carbonate and silicates, help remove food, bacteria, and some stains from your teeth.

一些稀有成分。包括碳酸钙和硅酸盐，能够帮助牙齿防止食物粘在上面，同时去除细菌和污垢。

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Sprinkle some baking soda inside your mug and wipe it around with a damp cloth. Stains from coffee or hot tea will quickly disappear.

在马克杯里撒一些小苏打然后用一块湿布在杯子里擦拭，咖啡和热茶留下的印记会快速消失。

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Can use a piece of clean flannelette accounted for some egg white to scrub, both to remove stains, and make the light leather.

能够用一块洁净的绒布占一些蛋清进行擦洗，既能够去掉污迹，又能使皮面亮光如初。

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Although there are arguably better products out there, the stains on the sleeve are still there, and it's time for some revolutionary innovation that will truly change the computing experience.

ENGADGET: Entelligence: Stains on the sleeve of my operating system

Besides some lint and paperclips, does it contain the supplies that will rescue you from injury, stress, stains, bad breath or worse?

FORBES: What Every Professional Needs In Her Desk Drawer

The magical properties of coffee stains have already spurred on some researchers to develop a better coating for TV screens, and it looks like they've now inspired a few folks to create a new type of touchscreen as well.

ENGADGET: Coffee-like stains inspire new type of touchscreen