How To Clean Your Coffee Maker, A Breeding Ground For Mold And Germs

Your drip coffee maker is one of the grossest objects in the house. Here's how (and how often) to wash it.
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Image by Marie LaFauci via Getty Images

The best part of waking up is certainly not mold in your coffee cup. But if you’re not properly cleaning your drip coffee maker, there’s a good chance that mold is what you’re going to get. If not mold, then at least germs and other unwanted lurkers. 

Coffee makers are among the germiest objects in the house, according to a 2011 study by the National Sanitation Foundation. That’s because coffee reservoirs are warm, moist environments, which makes them an ideal breeding ground for mold and yeast. 

Want to enjoy that cup of coffee with peace of mind? Here’s the best way to clean your coffee maker, according to an expert.

How to wash a drip coffee maker

After making a pot of coffee, Portland, Oregon-based barista and Califia Farms partner Morgan Eckroth told HuffPost that it’s a good idea to hand wash your carafe, especially if it’s made of stainless steel.

“Most coffee carafes for drip coffee makers are double-walled, so if you put them in the dishwasher, that can end up damaging the insulation ― so I always recommend hand washing,” Eckroth said.

She advises using hot water and a nonscented soap to get it extra clean. “I prefer nonscented just because I don’t want any leftover flavors, even though I’m doing a good job rinsing. I don’t want to risk any lavender coffee when I don’t want it.” 

Remove the coffee grounds and wash the basket.

Each time you use your coffee maker, hand wash the basket with lots of hot, soapy water, Eckroth said. “Generally, the coffee baskets on most home machines are going to be some sort of hard plastic, which can ultimately over time start to hold onto some flavor as coffee ends up sticking to it. So, use lots of hot soapy water. Having some sort of sponge or even some sort of scrubber is also super helpful because sometimes grime can build up if it goes for too long without a wash.”

If your grounds basket is made of metal, make sure you thoroughly dry it. “I’ve definitely had rust buildup happen when I forgot about them and did not dry them off,” Eckroth said.

Do a soft clean every 10 days.

People should do “soft cleans” of their coffee makers every 10 days or so. This entails using a product like Urnex cleaning powder, which helps to remove coffee oils and residues. “I will put some of the cleaning grounds into my coffee basket, like it were ground coffee, and then I’ll run a water cycle through it,” Eckroth said. “That way, all of that cleaning fluid is getting pushed through the pot. It’s getting pushed through the basket and you end up with a really nice clean machine overall.” 

Descale your coffee maker every 1-2 months.

Finally, don’t forget to descale your coffee maker. What you see when you make coffee is delicious hot java with an inviting aroma. What you don’t see, though, is the accumulation of minerals like calcium and magnesium that pass through your coffee maker’s heating element. According to Urnex, this buildup of mineral scale can prevent water from reaching its optimal brewing temperature, which can block water flow and also prevent your coffee from heating properly. “Generally, descaling is recommended every one to two months,” Eckroth said.

The process of descaling is a bit time consuming — plan on running water through your coffee maker three times to fully flush it out — but it’s worth it for a clean cup of coffee.

You can make your own solution with white vinegar, but Eckroth finds that it’s easier to buy one. “There’s a decent enough range of products, and usually if you look at the brand of your coffee maker they’ll have a recommendation,” she said. 

Descalers to try

One descaler to consider is Urnex Dezcal, which retails for $15.35. Urnex is the brand that a lot of industry professionals use, so it stands to reason that it would be great for home coffee makers, too. At-home coffee drinkers like the De’Longhi EcoDeCalk ($16.75) as a green option. Another to consider is this descaler by Impresa ($14.99).

HuffPost may receive a share from Urnex purchases made via the link above.

Before You Go

Small Reusable Coffee Tumblers That Aren't Enormous
A reusable glass tumbler for superior taste(01 of12)
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Why? For total coffee snobs and tea connoisseurs, a glass cup may ensure your daily drink tastes immaculate. Whereas metal and porous plastic cups can give off or retain flavors, glass is easy to clean and keeps your drink tasting pure.

How big? This mug holds 12 ounces (it also comes in 8 and 16) with a base diameter of 2.4 inches, so it should fit in your cup holder. It's 4.7 inches tall with the lid on.

Get it from Amazon for $26.
(credit:Amazon)
A collapsable thermos to pack in your bag(02 of12)
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Why? For commuting, traveling and just not having to carry around an empty mug all day after you've drunk your drank, this collapsable silicone mug folds up and fits right in your bag. It's also dishwasher and microwave safe.

How big? This mug is 12 ounces (though it also comes in 16 ounces, with a straw), it's 5 inches upright and 2 inches high when folded and its base diameter is 2 inches, so it should fit in your cup holder.

Get it from Amazon for $15.
(credit:Amazon)
A small travel mug with a handle(03 of12)
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Why? If you like a handle, this travel mug gives you the sensation of drinking out of a teacup or kitchen mug, only with vacuum insulation and a splash-proof lid.

How big? This mug holds 12 ounces (though it also comes in 16). It's 8.15 inches tall, with a 3.82-inch diameter. The handle may obstruct it from fitting in your cup holder, so check to make sure before you buy.

Get it from Amazon for $19.59.
(credit:Amazon)
For utilitarian chic you can take camping or to the office(04 of12)
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Why? With vacuum insulation and a locking lid, you can throw this tumbler in your hiking backpack without worry. Yet, the sleek, sweat-proof silhouette means you can take it to work and not feel like you're bringing camping gear to the office.

How big? This thermos holds 12 ounces. It's 6.34 inches tall and 3.3 inches in diameter, and should fit in most cup holders.

Get it from Amazon for $17.85.
(credit:Amazon)
For the most "to-go" coffee in a paper cup feel(05 of12)
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Why? So this is the mug I got for my dad. (Hope he's not reading this.) It looks like a literal paper cup from the coffee shop with the lid and paper holder. It's made of bamboo so it's super light, though not dishwasher safe. If you like the feeling of a paper cup but want to cut down on waste, this little guy is it.

How big? This exact cup is 8 ounces, though it comes in 12,14 and 16 ounces, too. The 8-ounce cup is 4.8 inches tall and has a 3.15-inch diameter, so it will fit in most cup holders.

Get it from Amazon for $19.95.
(credit:Amazon)
A ceramic cup with a silicone covering for a soft touch(06 of12)
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Why? This mug has the heat retention of a ceramic interior with the soft touch of a silicone covering. With a rounded top, you can drink with ease from both the cup (without the lid) and from the lid.

How big? This mug holds 12 ounces (though it also comes in 16). It's 4.53 inches tall and 2.99 inches in diameter, so it should fit in most cup holders.

Get it from Amazon for $20.93.
(credit:Amazon)
For pour-over fans and those who want to throw and go(07 of12)
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Why? With a twist-off, wide-mouth opening, you can make pour-over coffee directly in this travel mug. (There's even a pour-over dripper that fits with it.) Instead of worrying about lids and the little sippy hole and the flap that covers it, this mug just has a screw-on top like an old-school thermos. It's totally leak-proof, so you're safe to carry it in your bag.

How big? This mug holds 12 ounces (though it also comes in 16.) It's 5.16 inches tall and 3.39 inches in diameter, so it should fit in most cup holders.

Get it from Amazon for $30.
(credit:Amazon)
For brand loyalty (and one-use coffee pod users)(08 of12)
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Why? If you use a Keurig to make coffee, you can brew it directly into this mug. It fits directly into Keurig machines and single-use pod makers. It has a leak-proof lid and non-slip sleeve to keep you caffeinated on the go.

How big? This mug holds 12 ounces. It's 5.7 inches tall and 3.3 inches in diameter, and should fit in most cup holders.

Get it from Amazon for $11.99.
(credit:Amazon)
For a minimalist metal mug(09 of12)
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Why? For a fuss-free coffee to go, this mug doesn't have a sliding lid cover that coffee can get under. It comes in six basic covers, all with a black top, with no visible logos, brand names, sleeves, seams or other do-dads. It's as minimal as you can get, while still keeping your drink warm with double-wall vacuum insulation.

How big? This mug holds 8 ounces. It's 4.25 inches tall with the lid on and has a base diameter of 2.6 inches, so it should fit perfectly in most cup holders.

Get it from Amazon for $14.99.
(credit:Amazon)
For easy lid cleaning(10 of12)
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Why? This is one I bought myself a few winters back. It doesn't have a sliding lid cover, so it's super easy to clean, and the straight shape just feels good in your hand and looks nice on your desk. It's a basic, user-friendly winter thermos that's great for taking your coffee in the car.

How big? This mug holds 12 ounces. It's 5.4 inches tall and 3 inches in diameter, so it should fit perfectly in most cup holders.

Get it from Amazon for $9.99.
(credit:Amazon)
A "sweat proof" grip for people with clammy hands(11 of12)
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Why? If you get clammy hands or don't like to hold a hot cup, this stainless steel tumbler with a textured grip is your new best friend. Though it keeps your drink warm for up to six hours, it doesn't transfer heat and keeps your hands sweat-free. (It's also leak-proof and dishwasher safe.)

How big? This cup holds 12 ounces. It's 5.4 inches tall with a 2.6-inch diameter, so it should fit in all cup holders.

Get it from Amazon for $20.
(credit:Amazon)
To feel like you're drinking out of an artisanal ceramic mug you got at a craft fair(12 of12)
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Why? If you're the Phoebe of your friend group and tend to go for the more boho/handmade aesthetic, this reusable cup is warmer and more whimsical than most metal and minimalist ones. It feels like drinking out of your favorite hand-thrown clay mug, but still gives you the versatility of a to-go thermos.

How big? This mug holds 12 ounces. It's 4.7 inches tall with a 3.1-inch diameter, so it should fit nicely in your cup holder.

Get it from Amazon for $19.99.
(credit:Amazon)

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