How often should we wash our reusable coffee cups?

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One of the most charming things about the coffee kiosk I frequent every morning on my way to work is that they’ve nicknamed me “pink cup lady.” Recently, the barista apologised and asked me my actual name, but I insisted he call me by my coffee name: Pink Cup Lady.

But, last week my pink KeepCup exposed a rather shameful personality trait of mine: I’m very lazy when it comes to washing up. Usually this doesn’t really matter, because my unquenchable thirst for caffeine means there’s never any dregs in my KeepCup. But, last week I’d poured some cafetière coffee into my reusable cup and hadn’t given the consequences a moment’s thought. When I cracked open the lid, the inside of my beloved cup was caked with a thick layer of coffee grounds.   Read more…

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