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How To Keep Grass From Sticking To Mower Deck

Simple Tricks + How To Keep Grass Grass From Sticking to Mower Deck

Today we answer the age-old question; How to keep Grass from Sticking to Mower Deck? As you know, as you run your lawnmower, cut grass blades are constantly being “whipped” against the inside of the mower.

Over time as they stick to the inside of the mower deck, it causes a build-up of grass underneath the mower that you eventually have to wash off or scrape off.

Fortunately, there’s a simple way to keep your mower deck clean and in proper condition. Today we will show you how to do that and provide a few mowing tips along the way!

Why Is Grass Buildup on Mower Bad?

Grass build-up can cause a variety of problems once it gets thick enough. To begin with – Grass build-up will affect the efficiency of a mower. A mower’s ability to cut more grass and the overall performance of the mower inhibits airflow throughout the deck. 

Reasons Why Grass Build-Up is Bad for Your Mower.

Lawn Mowers Use “Airflow” to Operate Efficiently: By design, mowers need adequate airflow to operate correctly. The blades of grass won’t get sucked up into the mower deck efficiently, and the mower blade will not cut the grass adequately.

If grass build-up is terrible enough, it causes friction and resistance on the mower’s ability to cut grass, and it can even strain the mower’s engine and cause it to bog down.

In a worst-case scenario, grass build-up can cause a mower deck to rust out. This is because the built-up grass traps moisture against the metal mower deck and holds it there.

Moisture Causes “Rust”

Given enough time, that moisture will cause rust, eventually making the mower unusable if left unchecked.

Okay, now we know why keeping grass from building up inside your mower is important.

Let’s look now at some simple steps you can follow to prevent grass build-up on your mower.

How To Keep Grass From Sticking To Mower Deck:

Step 1: Access and “Clean the Mower Deck”

Before doing anything else, you must get under your lawnmower and give the underside of the deck a thorough cleaning. Some mowers have a hose attachment built-in to the top of the deck. If yours does, you can use it to clean the underside of your mower deck as you normally would.

However, If you need to clean the deck by flipping it over, here’s our recommendation.

First, disconnect the spark plug before turning it over to prevent damage and ensure safety.

Next, tip the mower over and keep the gas and oil reservoirs on the top to avoid spilling. You should also consider emptying the gas tank before cleaning the mower.

Scraping grass from mower deck | Best Home Gear
Step 1 – Scrape the Grass From Mower Deck

Household Tools to Clean Mower

To clean the deck thoroughly, spray the underside with a hose and let it soak for 5-10 minutes to soften up.

Then, Using a stiff plastic putty knife, remove the heaviest grass build-up, followed by a soft bristle brush and soapy water – to remove the remaining grass.

Note: Never use a wire brush or utility knife to clean the mower blade. A wire brush will scratch the manufacturer’s paint on the mower deck, eventually causing rust, creating the perfect “catch” surface for grass build-up.

Make sure all of the old grass has been removed from the deck – then proceed to the next step.

Step 2:  Learn How To Repaint Mower Deck

Lawn Mower manufacturers apply baked-on enamel paint to the entire mower deck. This paint is essential to avoiding grass build-up.

Remember, you want the grass blades to “slide” off the mower deck. Anything that hinders that – will cause the grass to “stick.”

If the deck underside paint of your mow is in bad condition – we highly recommend re-painting it with lawnmower paint.

The suggestions we offer below will have less value for keeping grass from sticking to the mower deck if the paint on your mower is severely scratched or rusted.

Step 3:  How To “Apply Coating” to Avoid Grass Build-Up

The reason that grass builds upon the underside of a lawnmower is that the surface allows it to stick. Once one layer of grass has built up, others can gradually accumulate on top of it until you have thick layers of grass caked on your mower deck.

spray lubricant for lawn mower deck | Best Home Gear
Spray an Even Coat of Lubricant on the Mower Deck – BestHomeGear

Lawn Mower Deck Spray

The best and easiest way to prevent this is to apply a spray lubricant that will keep the grass from sticking in the first place.

One of the most popular options for lubricating the underside of your mower deck is Dupont’s Teflon non-stick, dry-film lubricant.

This spray lubricant, while not explicitly designed for lawn mower decks and blades, is one of the most economical and highest-rated sprays to avoid grease, grime, and dirt build-up and works amazingly on mower decks as well.

Other top-rated products – branded as a spray-on lubricant for mower decks include Tite-Seal for mower decks sold at Amazon.

By evenly coating the mower deck in a layer of this lubricant after it has been cleaned and allowed to dry – you can dramatically help repel grass build-up.

Home Remedies To Coat Mower Deck

If you don’t have a specialized spray, there are any number of other “home” lubricants that will work well enough to get the job done. Some available options include WD-40, vegetable oil, and non-stick kitchen spray.

Motor oil can also work, but it has a habit of dripping off after a while – and wouldn’t be our first choice.

If you choose to use non-spray oil, rub it into the surface of the mower deck with a rag to ensure complete coverage and maximum adhesion. Clean off any excess non-spray oil before using the mower.

Graphite Coating for Lawn Mower Deck

A final option for preventing grass build-up is to use graphite spray coating. Graphite is a commonly used industrial lubricant and does a great job of preventing grass from sticking to your mower deck.

As with any other spray or lubricant, start with a dry, clean mowing deck. Most graphite sprays dry pretty quickly, but there will be a brief period of about 30 min. Required for drying when using graphite.

To be sure you’re applying the spray correctly, read and follow all directions provided on the bottle.

Step 4: Change “Mowing Habits” to Prevent Future Build-up

Even with a lubricant on the mower deck, grass will eventually build up – given enough time and the right conditions.

To maximize the amount of time between mower deck cleanings, here are a few simple new suggestions to improve your Lawn Mowing Habits:

Wait For the Grass To Dry

First and foremost, you should always wait until your grass is burnt to mow it. Mowing after a rainstorm or in the morning after a heavy dew will introduce more moisture into the clippings and make them more likely to stick together.

Set Your Mower Height On a Higher Setting

Setting Mower Height | Best Home Gear
Set Mower Height to High Setting – BestHomeGear.Com

Setting the height adjustment on your lawnmower is also a good idea. We recommend using a 3″ height if your mower can go that high.

Also, If you use your lawnmower on a short-setting height to “scalp” your lawn, you create much longer grass blades and, of course, more chance for build-up under the deck.

Mow Grass More Often

If you raise your mower deck and opt for slightly longer grass, you’ll find that you may have to mow more often – 5 days vs. a 7-day interval, for instance.

Incidentally, keeping your grass longer keeps shade at the roots, creates a much healthier, thicker, greener lawn, and keeps the weeds from getting a foothold.

Step 5: Maintain Lawn Mower “Deck Coating”

Once you’ve coated your mower deck with a lubricant, it’s essential to maintain that coating over time.

Routinely, attempt to keep the mower deck dry and avoid running over sticks and twigs as much as possible, as water or impacts from solid objects will wear down the coating over time.

From time to time, re-apply deck coating to keep the mower deck in optimal condition. We recommend re-applying coating at least every 24 mowings. This should keep your deck underside free from grass build-up.

How To Clean “Riding Mower” Deck – With “Wash Port”

Because it’s difficult to access the bottom of a Riding Lawn Mower deck – most newer riding lawn mower brands feature one or more “wash port” locations for cleanout.  To use the wash port feature to clean the riding mower deck, follow these simple steps:

Step 1: Start Mower

Start your Riding mower and move it to a flat and open area of your lawn – away from buildings.

Step 2: Attach Port Adapter

Attach the wash port adapter that came with your riding mower to your garden hose (if you don’t already have your local dealer should)

Step 3:  Attach Garden Hose

Attach a garden hose to the adapter on your mower wash port located on the mower deck.

Step 4:  Start Mower

Turn on the riding mower, and disengage the mower blade(s), leaving the mower running.

Step 5:  Turn On The Water

Turn the water on, connect to the garden hose, and “washport” to clean the underside of the mowing deck.

Step 6:  Engage Mower Blades

Sitting on the riding mower, engage the mower blade(s) and let it run for 4-5 minutes to remove built-up grass clippings and debris from the underside of the mower deck.

Step 7:  For Riding Mower With Multiple Wash Ports

If you have more than one Wash Port on your riding mower – remove the garden hose and Repeat Steps 3 – 6 with additional wash ports.

If your mower only has one wash port, you’re done!

Tips For Cleaning Mowers That Have Wash Port:

TIP #1:  While some riding mower owners use the wash port “every time” they mow, we recommend doing this routine maintenance at least 2-3 times per season.

TIP #2:  Visually check the underside of the riding mower deck occasionally by raising the front wheels. Some folks use a nearby curb to choose a safe method

Using a flashlight, inspect the underside of the mower deck and scrape any grass build-up not removed by using the wash port cleaning method.

Frequently Asked Questions:

Does it help to replace the mower blade?

Many manufacturers include a standard mower blade with the sale of their equipment, especially for budget models.

If you find your mower – after cleaning – is still not cutting correctly, go online or to your local hardware store and get a “High-Lift” mowing blade. These blades will create more airflow and lift, allowing more time to cut the grass adequately.

Should I run a mower on a full-throttle or slower speed?

Most modern-day mowers are designed to run at full throttle. For this article, it is inherently essential to do so. Full-throttle motor speed creates the maximum lift and cutting ability for your mower. These factors both contribute to less build-up as grass clippings get ejected quicker.


As a result of these tips – your lawn mower will run much more efficiently, and your maintenance time will be cut down dramatically. You should also be able to increase your walking speed – that is, without bogging down your mower and leaving those tell-tale “trails” behind.

Now that you know how to keep grass from sticking to the mower deck undersides, you might actually “like” mowing again. After all, It’s a win-win-win – when you spend less time mowing and cleaning and get a healthier lawn along the way!

Thanks for visiting us here at BestHomeGear.Com – Be Sure to Check out all our How-To Guides.

References & Additional Reading:

Kevin is the author and editor for Best Home Gear. In addition to his work in publishing, Kevin enjoys exploring the Outdoors in Michigan and Arizona, Hiking, Cycling, Fishing, Reading, and Completing Projects for Home and Garden.

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