How to Clean Your Grinder with Urnex Grindz Tablets

If your grinder leaves behind faint old coffee flavors or smells odd even after a full brush-out, you’re not alone. Even with regular scraping, brushing, and wiping, ground coffee residue builds up over time—especially that oily layer inside the burrs and chute. That buildup affects taste. So what actually works to clean it properly without dismantling the whole machine?

The fastest, easiest solution? Run a cleaning tablet like Urnex Grindz through your grinder. In our test, 25 tablets showed partial results, but 50 used at the finest grind setting effectively cleared oil and odor—without disassembly.

What Is Urnex Grindz and Who Made It?

Urnex Grindz are tablet-shaped cleaner designed specifically for coffee grinders. Developed and tested in partnership with German grinder manufacturer Mahlkoenig, these tablets are made primarily from corn—a natural, edible, and non-toxic ingredient. Given the food safety standards in both the U.S. and Germany, they're generally considered safe for regular use in coffee equipment.

Why Coffee Grinders Need Periodic Deep Cleaning

Over time, coffee oils and fine particles build up inside the burrs and grinding chamber. This residue isn’t removed by standard brushing alone. The trapped coffee oils oxidize, leading to off-flavors and stale aromas that can affect the taste of freshly ground coffee. Regular users—especially those pulling espresso or making coffee daily—will notice these effects more acutely.

While you can manually clean burrs with brushes, scrapers, and cloths, some areas (like the grinding chute or hard-to-reach burr edges) are difficult to fully clear. That’s where a cleaner like Grindz helps: it’s designed to flush out that residual buildup without taking the grinder apart.

How We Tested Grindz on a Flat Burr Grinder

In our test, we used a grinder fitted with large flat burrs (not specified as Mazzer Major-sized, but larger than typical conical burrs). We began with a visual inspection

Our first attempt used 25 tablets, running them through at a slightly finer-than-normal grind setting. We later repeated the process with around 50 tablets, this time using the finest possible grind setting to maximize contact time between the tablets and the burrs. The burrs were not removed during any stage of testing.

What Happened During the Cleaning Process

With just 25 tablets, results were limited. The burr surfaces looked somewhat cleaner but the grinding chute still held old coffee dust, and the oily film on the burrs remained visible. It became clear that the amount used was insufficient for a full clean, especially in a grinder with larger burrs and a bigger grinding path.

After adding roughly 50 tablets and adjusting to the finest grind setting (to keep the tablets in the burr chamber longer), the difference was noticeable. The burr edges appeared shiny and clean, with virtually no visible oil residue. A quick pass with a clean brush revealed a much tidier grinding surface. The chute still showed some leftover coffee dust, but the worst of the oily buildup was gone. Odor was also reduced significantly.

Does It Affect the Taste of Your Next Coffee?

Immediately after cleaning, we dosed five Geisha (Ethiopia Yirgacheffe) beans and then added two more scoops for a full brew. No lingering corn or tablet flavor was detected in the cup. If anything, the coffee tasted cleaner, with no stale or oily undertones. That suggests the cleaning cycle was effective—and that there’s no negative impact on flavor when used as directed.

Frequently Asked Questions

What are Urnex Grindz tablets made of?

Urnex Grindz tablets are primarily made of corn. They are non-toxic, natural, and edible. The formula is designed to be food-safe, meeting standards in both the United States and Germany.

How many Grindz tablets should I use per clean?

In our test, 25 tablets showed minor improvement, but around 50 tablets used at the finest grind setting gave the best results—fully clearing oil and odor from the burrs. Fewer tablets may work for smaller or conical burr grinders.

Do I need to remove the burrs to use Grindz?

No. Grindz are designed to be used without removing the burrs. Simply run the tablets through your grinder like regular coffee, preferably at a fine grind setting for best effect.

Which grinders benefit most from Grindz cleaning tablets?

Grindz are ideal for espresso grinders and other machines with hard-to-clean or non-removable burrs—including many automatic and super-automatic coffee machines. They also work well with smaller conical burr grinders. Larger flat burr grinders may require more tablets for the same result.

Will Grindz leave a weird taste in my next coffee?

No. When used as directed, Grindz leave no aftertaste. Our test cup of Geisha showed no corn or cleaner flavor afterward, just a cleaner-tasting brew.

Recommended FrontStreet Beans for Grinder Maintenance

After cleaning your grinder with Grindz, try a bright, high-clarity coffee to enjoy the difference. FrontStreet’s Ethiopia Yirgacheffe displays floral and citrus notes with a clean, juicy body—perfect for highlighting a freshly cleaned grinder. For something more chocolatey and structured, their Brazil Cerrado offers nutty and sweet profiles. Or explore the fruity complexity of FrontStreet’s Kenya AB, with tart berries and winey acidity. All three single origins respond well to a residue-free grind. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.