Learning how to wash a lawn mower is a key piece of seasonal maintenance that many homeowners overlook. Cleaning your mower after the season prevents corrosion and keeps it running smoothly next spring. A thorough wash removes grass clippings, mud, and debris that can hide problems and cause premature wear.
This guide provides a clear, step-by-step process. You will learn the safe way to clean every part of your machine, from the deck to the engine.
Following these steps will extend your mower’s life and ensure reliable performance. Let’s get started with the preparation.
How To Wash A Lawn Mower
Before you begin spraying water, proper preparation is essential. Rushing into cleaning can lead to damage or even injury. Always prioritize safety and gather your tools first.
Start by consulting your owner’s manual. It may have specific warnings or instructions for your model. If you’ve lost it, you can often find a digital copy online.
Safety First: Critical Preparatory Steps
Never skip these safety steps. They protect you and prevent costly damage to your mower’s engine and electrical systems.
- Disconnect the Spark Plug: This is the most important step. Locate the spark plug wire and disconnect it from the plug. This ensures the engine cannot accidentally start while you are working.
- Drain the Fuel Tank: For gasoline mowers, either run the engine until the tank is empty or use a siphon to remove the fuel. Storing a mower with old gas over winter can clog the carburetor.
- Remove the Battery (If Electric): For cordless electric mowers, take out the battery pack. For corded electric mowers, ensure the cord is unplugged and stored away.
- Allow the Engine to Cool: If you’ve recently used the mower, let it sit for at least an hour. Cleaning a hot engine can cause thermal shock and crack components.
Gathering Your Cleaning Supplies
You don’t need fancy equipment. Most items are probably already in your garage or shed. Here’s what you should collect:
- Garden hose with a spray nozzle
- Stiff-bristled brush (plastic or nylon is best)
- Putty knife or plastic scraper
- Bucket of warm, soapy water (use dish soap or a degreaser)
- Old towels or rags
- Spray lubricant (like WD-40) and fresh engine oil
- Safety glasses and work gloves
Choosing the Right Cleaning Location
Pick a flat, well-drained area like a driveway or patio. Avoid washing on a lawn, as runoff containing oil and chemicals can harm your grass. Ensure you have good light to see what you’re doing.
Step-By-Step Cleaning Process
With safety handled and supplies ready, you can begin the actual cleaning. Work methodically from top to bottom for the best results.
Step 1: Clear Major Debris
Start by removing large clumps of grass and mud. Use your putty knife or a brush to scrape the underside of the mower deck. This area, known as the deck, holds the most compacted material.
Tip the mower carefully. Always tip it so the air filter and carburetor side face upward. Tipping it the wrong way can allow oil to flood the engine cylinder.
Step 2: Pre-Soak and Scrub the Deck
Spray the underside of the deck with your garden hose to loosen debris. Then, apply your soapy water and let it sit for 5-10 minutes. Use the stiff brush to scrub away all remaining grass and rust.
A clean deck ensures proper grass discharge and prevents rust. It also helps maintain optimal blade performance for a even cut.
Step 3: Wash the Exterior Surfaces
Move to the top of the mower. Wipe down the engine cover, handle, and wheels with a rag dipped in soapy water. Avoid spraying water directly onto the engine, air filter, or electrical components.
For stubborn grease spots on the engine, use a dedicated degreaser spray. Apply it, let it sit, and then wipe it away with a rag. Do not rinse it with high-pressure water.
Step 4: Rinse Thoroughly
Using your garden hose on a gentle spray setting, rinse all the soap and loosened dirt from the mower. Start from the top and work down, directing water away from the engine’s sensitive areas.
Never use a pressure washer. The intense force can drive water into bearings, the carburetor, and electrical connections, causing serious damage.
Step 5: Dry Completely
This step is crucial to prevent rust. Use old towels to dry the mower as much as possible. Then, let it air-dry in the sun for a few hours.
You can also start the engine (after reconnecting the spark plug) and let it run for a few minutes. The heat will help evaporate any remaining moisture from the engine block.
Post-Cleaning Maintenance And Lubrication
Washing is only half the job. Applying lubricants and performing checks after cleaning prepares your mower for storage or its next use.
Sharpen or Replace the Blade
A clean mower is the perfect time to service the blade. Remove it carefully with a wrench. Inspect it for deep nicks or cracks. You can sharpen it with a file or take it to a shop.
A sharp blade cuts grass cleanly, which is healthier for your lawn. A dull blade tears grass, leaving it vulnerable to disease.
Lubricate Moving Parts
Apply a few drops of oil to the wheel axles and any height adjustment levers. This keeps them moving freely and prevents seizing. Check your manual for specific grease points on the deck spindle.
Check the Air Filter and Oil
Remove the air filter and tap it gently to dislodge dust. If it’s paper and very dirty, replace it. For foam filters, wash them in soapy water, dry, and apply a light coat of fresh oil.
Check the engine oil level and condition. If it’s dark and gritty, change it according to your manual’s instructions. Fresh oil protects the engine during storage.
Apply a Light Protective Coating
To prevent rust on the cleaned mower deck, you can spray a thin layer of silicone spray or a dedicated lawn mower protectant. Wipe off any excess.
Special Considerations For Different Mower Types
While the core process is similar, different mower types have unique needs. Here’s what to keep in mind for your specific machine.
Washing a Riding Lawn Mower
The process is similar but larger. Pay extra attention to cleaning the steering column, under the seat, and the large deck. Ensure the battery terminals are clean and tight after washing.
Always engage the parking brake and chock the wheels before you start working on a riding mower for safety.
Cleaning an Electric Lawn Mower
With electric mowers, water and electricity are a dangerous mix. Be extra cautious. Never submerge any part of the mower. Use a damp cloth for most cleaning instead of a hose.
Ensure the battery port and motor housing are completely dry before reattaching the battery. Store the battery indoors in a cool, dry place.
Maintaining a Robotic Mower
Robotic mowers require gentle care. Wipe the sensors, charging contacts, and casing with a damp cloth. Clear any debris from the wheels and cutting disc. Follow the manufacturer’s cleaning guide closely.
Common Mistakes To Avoid
Knowing what not to do is as important as knowing the correct steps. Avoid these common errors to protect your equipment.
- Using a Pressure Washer: As mentioned, the high pressure forces water where it shouldn’t go, leading to corrosion and engine problems.
- Spraying Water Directly on the Engine: Water can ruin the air filter, spark plug, and carburetor. Clean these parts separately with rags.
- Storing the Mower Wet: This is a surefire way to promote rust and mold. Always ensure the mower is completely dry.
- Forgetting to Reconnect the Spark Plug: You won’t be able to start the mower next time if you leave it disconnected. Make it the last step of your process.
- Using Harsh Chemicals: Strong solvents can damage plastic parts and painted surfaces. Stick to mild dish soap or products designed for engines.
FAQ: Your Lawn Mower Cleaning Questions Answered
Here are answers to some frequently asked questions about washing lawn mowers.
How often should I wash my lawn mower?
You should do a basic clean after every few uses, like removing grass from the deck. A deep, thorough wash like the one described here is best done at the end of the mowing season before storage.
Can I use a hose on my electric mower?
It is not recommended. Use a damp cloth or sponge to clean the body. For the underside, you can carefully use a low-pressure spray from a hose, but avoid all electrical components entirely. Always check your manual first.
What is the best thing to clean a lawn mower deck with?
A plastic scraper and a stiff brush with soapy water are very effective. For tough, caked-on grass, some people use a diluted vinegar solution or a commercial deck cleaner. Avoid abrasive metal brushes that can scratch the protective coating.
Is it okay to leave gas in the mower over winter?
No, it is not okay. Old gasoline will break down and form a varnish that clogs the carburetor and fuel lines. Either drain the tank completely or add a fuel stabilizer if you must store it with some gas.
Following this comprehensive guide on how to wash a lawn mower will save you time and money. It prevents unexpected repairs and ensures your machine is ready to go when the grass starts growing again. Regular cleaning is a small investment that pays off with a longer-lasting, more reliable lawn mower.