Grindz Grinder Cleaner

Grindz is a grinder cleaning product made by Urnex, the same company behind Cafiza espresso machine cleaner. You run the tablets through your grinder like you would coffee beans, and they absorb stale coffee oils, remove residue, and clear out old grounds stuck in the burr chamber. I use Grindz every 3-4 weeks on my home grinders, and the difference it makes in coffee flavor is real and noticeable.

If you've never cleaned your grinder beyond a quick brush-out, you're probably tasting rancid oils in every cup without realizing it. Old coffee oils oxidize and go stale within days, and they coat your burrs, your grinding chamber, and your chute. Grindz is the easiest way to remove that buildup without disassembling anything.

How Grindz Works

Grindz tablets are made from a food-safe, grain-based compound (primarily wheat and corn) that's been formulated to absorb oils and carry away stuck particles. They're harder than coffee beans, which helps them scrub the burr surfaces as they pass through.

The Basic Process

  1. Empty your hopper of all coffee beans
  2. Add a capful of Grindz tablets (about 35-40 grams, or one single-use packet)
  3. Run your grinder until all the tablets have passed through
  4. Discard the Grindz powder that comes out (it'll look brown and oily, that's the residue it absorbed)
  5. Run a small amount of coffee beans through to purge any remaining Grindz residue
  6. Discard that coffee too

The whole process takes about 2 minutes. That's it. No disassembly, no screwdrivers, no compressed air.

What Comes Out

The first time I used Grindz on a grinder I'd been using for months without cleaning, the output was dark brown and smelled like stale oil. It was honestly gross, and it made me realize how much old residue had been sitting in there, flavoring every cup I made.

After a few regular cleanings, the Grindz output gets lighter and less oily, which tells you the buildup isn't accumulating as badly. Regular use keeps things clean rather than having to do a heavy restoration each time.

When and How Often to Use Grindz

The frequency depends on how much you grind and what kind of beans you use.

For Home Use

If you grind once or twice a day (typical single household), cleaning every 2-4 weeks is a good rhythm. I lean toward every 2 weeks during summer because heat accelerates oil rancidity, and every 3-4 weeks in cooler months.

If you mostly grind light roasts, you can stretch the interval a bit. Light roasts have less surface oil than dark roasts, so they leave less residue behind. Dark and oily beans, but, coat everything much faster. If you grind dark French or Italian roasts, clean every 1-2 weeks.

For Cafe and Commercial Use

Cafes grinding multiple kilograms per day should run Grindz through their grinders daily, usually at closing. Some shops do it twice daily for high-volume grinders. The cost is negligible compared to the flavor impact of dirty burrs during service.

Signs You're Overdue for a Cleaning

  • Your coffee tastes flat, bitter, or stale even with fresh beans
  • You see visible oil buildup around the burr chamber or chute
  • The grinder sounds different (grinding can become louder or rougher as residue builds up)
  • Grounds are clumping more than usual due to oil-coated particles sticking together

Grindz vs. Other Cleaning Methods

Grindz isn't the only way to clean a grinder. Here's how it stacks up against alternatives.

Grindz vs. Dry Rice

You'll see this advice online constantly: "Just run rice through your grinder." I strongly recommend against this. Rice is much harder than coffee beans and can chip burrs, especially ceramic burrs. It can also jam smaller grinders and void warranties. Several grinder manufacturers, including Baratza, explicitly warn against using rice.

Grindz tablets are specifically formulated to be safe for grinder burrs. They're softer than rice and won't cause mechanical damage.

Grindz vs. Manual Brushing

Brushing out your grinder with the included brush (or a dedicated grinder brush) removes loose grounds but doesn't do much for oil buildup. Oils cling to metal surfaces and won't come off with dry bristling. Think of it like wiping down a greasy pan with a dry paper towel. You'll get the chunks off, but the grease stays.

My recommendation: brush out loose grounds weekly, run Grindz every 2-4 weeks, and do a full disassembly/deep clean every 3-6 months. This layered approach keeps your grinder performing at its best without being overly time-consuming.

Grindz vs. Full Disassembly

Taking apart your grinder and scrubbing the burrs with a brush and some Cafiza solution is the most thorough cleaning possible. But it's also time-consuming (20-30 minutes), requires reassembly and realignment, and risks damaging components if you're not careful.

Grindz fills the gap between quick brush-outs and full disassembly. It handles the oil problem without requiring tools, and it takes two minutes instead of thirty.

Does Grindz Affect Flavor?

This is the question people always ask, and the answer is: Grindz itself does not affect your coffee's flavor if you purge properly. After running Grindz through your grinder, you need to run about 10-15 grams of coffee beans through to flush out any tablet residue. Toss that coffee. The next grind after that will be clean and Grindz-free.

I've done side-by-side taste tests, grinding the same beans before and after a Grindz cleaning. The post-cleaning coffee consistently tastes brighter and cleaner, especially in the mid-tones and aftertaste. That staleness in the finish disappears.

If you're buying good quality specialty coffee and grinding fresh, a dirty grinder is working against you. All the money you spend on nice beans gets undermined by rancid oil residue coating those beans during grinding.

For recommendations on grinders that are easy to maintain and clean, check out our best coffee grinder and top coffee grinder guides.

Cost and Where to Buy

Grindz comes in two formats:

  • Single-use packets: Boxes of 3 or 24 individual packets. Each packet is one cleaning dose.
  • Jar: A 430g jar with a measuring cap. This is the better value for home use, lasting 10-12 cleanings.

A jar runs about $15-20 and lasts most home users 6-12 months. That works out to about $1.50-$2.00 per cleaning. Given the flavor improvement and the extended life it gives your burrs (clean burrs stay sharp longer), it's one of the cheapest upgrades you can make to your coffee routine.

You can find Grindz at most specialty coffee retailers online and on Amazon.

FAQ

Is Grindz safe for all grinder types?

Grindz is safe for both flat and conical burr grinders, ceramic and steel burrs. It's also safe for blade grinders, though blade grinder cleaning is less impactful since there are fewer places for residue to hide. Do not use Grindz in hand grinders, as it's designed for electric grinders only.

Can I use Grindz in my espresso grinder?

Yes. Grindz works in espresso grinders and is commonly used in commercial espresso grinders at cafes. Set your grinder to a medium setting before running Grindz through. Don't run it on your espresso-fine setting, as the tablets may jam.

Does Grindz contain allergens?

Yes. Grindz contains wheat and corn, which means it's not gluten-free. If you or someone using the grinder has a gluten sensitivity or celiac disease, make sure to purge thoroughly with sacrificial beans after cleaning. The amount of residual gluten after a proper purge is minimal, but it's worth being aware of.

How is Grindz different from Urnex Full Circle?

Full Circle is Urnex's newer, organic grinder cleaner. It serves the same purpose as Grindz but uses organic ingredients. Performance is similar in my experience. Full Circle costs a bit more, and if you don't need the organic certification, regular Grindz works just as well.

Keep Your Grinder Clean

A tube of Grindz and two minutes every few weeks is all it takes to keep your grinder performing the way it should. If you've been putting off grinder cleaning because it seems like a hassle, Grindz removes that excuse entirely. Your coffee will taste better, your burrs will last longer, and you'll stop wondering why that expensive bag of single-origin beans tastes slightly off. Start with one cleaning and taste the difference for yourself.