How to Clean Your Herb Grinder

How to clean a manual grinder

Welcome to our guide on cleaning your herb grinder. 

We’ve touched on many different topics in our blog, from history of grinders to grinder selection, but now we want to get down and dirty with a part of grinding that most don’t enjoy: cleaning your herb grinder.

Cleaning a herb grinder is probably not your favourite part of owning such a tool, but it is very important if you want to enjoy your herbs. 

A grinder is a tool, and like all tools, it does require some maintenance from time to time.  Fortunately, cleaning is not a particularly difficult or time consuming thing to do, so once you get into a cleaning routine you’ll find it doesn’t take much away from the enjoyment of your herbs.

A quick note on grinder material:

In this article, we’re focusing on the cleaning of metal grinders.  If you have a novelty plastic, wood, or stone grinder, follow the special care instructions that should have come with the grinder.  Wood, plastic, and stone aren’t the best materials for grinders and can be porous and easy to damage, so you’ll need to follow special care instructions for these units.



When to Clean

When to clean your herb grinder


How often should you clean your grinder?  Well, this depends on what you’re using it for.

1 - The Frequent User

If you only ever grind a single type of herb and use your grinder frequently, you don’t really need to clean your grinder each and every day.  Because you’re constantly using the same sort of herb, taste transfer isn’t a big deal and old herbs in the grinder won’t go bad in the day between grinds.

However, even if you use your grinder frequently, you’ll still need a cleaning routine so that herb debris or oil from oily herbs doesn’t gum up the mechanism and make the grinder difficult to use. 

If you’re finding that your grinder is getting hard to use, or in the case of an electric grinder it doesn’t seem to have the same power, it is time to disassemble and clean.

2 - The Infrequent User

If you only rarely use your grinder, it is a good idea to clean it after every use.  Herbal residue in the grinder will go stale with time, and if mixed with fresh herbs in your next grind, will tarnish the taste and effect of the next use.

3 - The Multiple Herb User

If you switch between different herbs, or like to try different strains of a single type of plant, you’ll want to get good at cleaning every time you make a switch.

Fresh and old herbs often don’t mix, so if you don’t clean it well between each different plant you’ll find that the experience of one will be ruined by lingering tastes and odours of previous grinds.


What You Need to Clean

What You Need to Clean your grinder


Now that we’ve discussed when to clean, we need to assemble our supplies.  Luckily, it doesn’t take anything too expensive or elaborate to clean a grinder.  Here is what you’ll need:

  • Isopropyl alcohol
  • A freezer
  • A medium-stiffness toothbrush
  • A sink
  • A cleaning surface, and rags and/or paper towels

See, not so bad.  Many of these items most people have anyways.


Easiest Ways to Clean a Grinder

For pot enthusiasts, herb grinders are as essential as the weed itself. However, with regular use, grinders can become sticky and clogged with resin. Here are some of the easiest ways to clean your grinder.


How to Clean with Soap and Water

How to Clean a Herb Grinder with Soap and Water


Good old soap and water work well to clean an herb grinder.  Simply take your grinder apart and soak all non-electric components in hot water with dish soap while scrubbing with a toothbrush to loosen and remove all plant material.  Again, this should be done after cooling the grinder and removing the largest chunks.


Once you’ve finished cleaning your grinder with soap and water, give it a good rinse under hot water and allow it to air dry (or use the hairdryer as mentioned above).  This method is great for those that don’t like the odor of isopropyl alcohol, and dish soap does a good job tackling greasy messes such as what is found in many grinders after they are used to grind an oily herb.

How to Clean with the Freezer Method

How to Clean with the Freezer Method


Why is a freezer on the list above?  Simple: many herbs are oily and greasy, which makes them hard to clean.  They just sort of spread around instead of coming out of the grinder when you are trying to clean them.

A freezer solves this problem by cooling the oils down to a temperature where they behave more like solids instead of oily liquids.  This makes it much easier to clean a grinder, so the first step to a deep clean is to place the grinding mechanism in your freezer for 10 minutes or so (it just needs to cool down, not spend the night in there) to solidify the herbal residue.


  1. Disassemble your grinder and place it in a plastic bag.
  2. Put the bag in the freezer for about an hour.
  3. After removing it, tap the grinder parts on a solid surface to dislodge the frozen particles.
  4. Use a small brush or toothpick to remove any remaining residue.


    If you have an electric grinder, make sure you remove the batteries before freezing!  Unless the manufacturer says otherwise, the freezer is not a great place for batteries.  If the battery is integral to the grinder, then only put parts that can be removed in the freezer.


    Chemical Cleaning Agents

    For those who prefer a more scientific approach to cleaning their weed grinder, chemical cleaning agents can be your best friends. They're effective, accessible, and easy to use. Let's dive into some of the most common ones: Hydrogen Peroxide and Isopropyl Alcohol.

    Cleaning Weed Residue with Hydrogen Peroxide

    Hydrogen peroxide is a common household item, typically used for wound disinfection due to its antimicrobial properties. But did you know it can also be used to clean your weed grinder?

    The answer is yes, hydrogen peroxide can effectively clean weed residue. The bubbling action of hydrogen peroxide helps lift and remove stubborn resin, making it easier to scrub away. However, it's important to remember that hydrogen peroxide can cause discoloration on some metals, so it's best used on glass or ceramic grinders.

    Here's how to do it:

    1. Disassemble your grinder.
    2. Soak the pieces in a bowl of 3% hydrogen peroxide solution for about 20-30 minutes.
    3. Use a toothbrush to scrub any stubborn spots.
    4. Rinse thoroughly under warm water to ensure all hydrogen peroxide is washed away.
    5. Let it air dry completely before use.

    Using Isopropyl Alcohol to Dissolve Weed Residue

    How to Clean with Isopropyl Alcohol


    Isopropyl alcohol is a great solvent for cleaning grinders.  It is a disinfectant and prevents bacterial growth, but also dissolves herbal residues such as oils and physical material, and takes a lot of work out of straight scrubbing.

    Remember, isopropyl alcohol is flammable, so avoid using near open flames or high heat. Also, ensure your grinder is completely dry before using it again to avoid any alcohol taste in your weed.

    After your grinder has been cooled off in the freezer and the biggest pieces of herbs removed, you can use isopropyl alcohol to clean it out.  However, if you don’t need the deepest of cleans, you can just start with the isopropyl alcohol since it is a great cleaner.

    If you are doing a deep clean, you can place metal pieces of your grinder in a container with isopropyl alcohol (such as the grinding head, not an entire electric grinder) and let it sit for 30 minutes before carrying on with the process.  If you’re doing a quicker clean, then simply spraying some isopropyl alcohol into the grinder or putting it on the brush is enough to get the grinder reasonably clean.

    Once the alcohol has been applied to the grinder and has had the time to soak into the plant material, use a brush to gently remove the debris from the grinder.  Once you’ve cleaned out debris, run the grinder under hot water and blot dry with a paper towel or a rag and allow the grinder to air dry.

    Tip: If you want to speed up the drying process, a hair dryer works well!


    Alternative Cleaning Methods

    In the world of cannabis, a clean weed grinder is a happy grinder. But what happens when you can't or don't want to use alcohol to clean it? Fear not, there are alternative methods for maintaining your device, and you probably have the ingredients in your kitchen already.

    Cleaning Weed Grinder Without Alcohol

    For those days when you're out of isopropyl alcohol or just want to switch things up, several household items can effectively clean your weed grinder.

    Firstly, warm water and dish soap can work wonders. Disassemble your grinder, soak the pieces in warm soapy water, scrub them with a toothbrush, rinse, and let them air dry.

    Another method is using a combination of salt and lemon juice. The salt acts as an abrasive to scrub away residue, while the citric acid in the lemon juice helps break down the gunk. Simply mix equal parts salt and lemon juice into a paste, apply to the grinder, let sit for 5-10 minutes, then scrub and rinse.

    Will Vinegar Clean a Weed Grinder?

    Vinegar, specifically white vinegar, can be a potent cleaner due to its acidic nature. However, it's essential to note that vinegar can leave a strong smell behind, which might not be ideal for your next grinding session.

    To clean your grinder with vinegar, disassemble it and let the pieces soak in a bowl of white vinegar for about 30 minutes. After soaking, use a toothbrush to scrub any stubborn spots. Rinse thoroughly under warm water to ensure all vinegar is washed away, and let it air dry completely before use.

    Cleaning Weed Grinder with Milk: A Step-by-Step Guide

    This may sound surprising, but milk can also clean your weed grinder. The fats in the milk help absorb and remove the resin build-up in your grinder. Here's how to do it:

    1. Warm up a cup of milk until it's hot but not boiling.
    2. Disassemble your grinder and place the pieces in the hot milk.
    3. Let them soak for about 30 minutes to an hour, stirring occasionally.
    4. After soaking, use a toothbrush to scrub any stubborn areas.
    5. Rinse thoroughly under warm water and let it air dry before use


    Related Article: Herb Grinder Cleaning Hacks


    Grinder Usage and Maintenance

    Proper usage and maintenance of your weed grinder can significantly enhance its lifespan, ensuring you get the most out of your investment. In this section, we will cover some common questions and concerns about grinder usage and maintenance, including mold prevention, leaving weed in a grinder overnight, and the use of wet grinders.

    Preventing and Addressing Mold in Weed Grinders

    Mold in a weed grinder? Yes, it can happen. If your grinder is not properly cleaned and dried after use, moisture can lead to mold growth. Moldy weed can be harmful if smoked, so it's crucial to prevent mold growth and know how to address it if it does occur.

    To prevent mold, always ensure your grinder is dry before storing it. Regular cleaning is also essential. If you notice mold in your grinder, don't panic. Here's what to do:

    1. Disassemble your grinder.
    2. Discard any weed that was in the grinder.
    3. Soak the grinder in a 1:1 solution of isopropyl alcohol and water for about 30 minutes.
    4. Scrub with a toothbrush to remove any mold.
    5. Rinse thoroughly and let it air dry completely before use.

    Leaving Weed in a Grinder Overnight: What You Need to Know

    Can you leave weed in a grinder overnight? The short answer is yes, but it's not ideal. Leaving ground weed in your grinder for extended periods can lead to dryness, reducing the quality of your smoke.

    If you must leave your weed in the grinder, ensure it's stored in a cool, dark place to preserve its potency. Also, consider investing in a grinder with a kief catcher to collect the trichomes that fall off during grinding.

    Wet Grinder Usage and Maintenance

    A wet grinder is typically used for grinding food grains into a paste. But can it be used for weed? Technically, yes. However, it's not recommended as the high-speed operation can pulverize the weed too much, affecting the quality of your smoke.

    If you decide to use a wet grinder, ensure your weed is thoroughly dry before grinding. Too much moisture can cause the weed to stick to the grinder, making it hard to clean. Speaking of cleaning, make sure to clean your wet grinder after every use to prevent residue build-up and potential mold growth.

    Remember, proper maintenance and usage of your grinder can significantly enhance its lifespan and the quality of your smoke.

    Tips and Tricks for Quick Cleaning Between Grinds

    Tips and Tricks for Quick Cleaning Between Grinds


    Now that we have covered cleaning methods for your herb grinder, let’s talk about some basic habits that you can develop that will make cleaning easier: cleaning between each use.

    Whenever you grind all of the herbs in your grinder and it is empty, it is a good idea to disassemble to the grinder and shake out any loose particles.  Don’t just do this anywhere: unless you want to lose your herbs, make sure you do this over something that will allow you to collect all of this product.

    After shaking, use a brush (like a toothbrush) to go a little bit deeper and pull out material caught in between the teeth.  It is a good idea to keep such a brush with the grinder for this purpose, and use a different one for deep cleans.

    These steps should not take much time, and are a great way to keep your grinder from getting too dirty too quickly.  While not a substitute for the deeper cleaning methods described above, a habit of quickly cleaning out large particles in your grinder between grinds will save you herbs and keep your grinder in tip-top condition.


    drying with a towel


    Good-quality herb grinders are largely maintenance-free and don’t require much from the operator to stay in good condition. 

    However, complete neglect will result at best in unwanted taste transfer and poor grind performance and, at worse, seizing of the grinder. 

    Thankfully it doesn’t take much to clean these wonderful little machines, so use this article as your go-to guide for cleaning your grinder and enjoy trouble-free grinding!


    Related Article: 10 Best Electric Herb Grinders in 2023

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