8 Supplies for Winterizing a Pressure Washer and Sprayers

The first hard freeze of autumn always arrives faster than expected, turning small amounts of trapped water into cracked manifolds and ruined pumps. Taking time to properly shut down pressure washers, backpack sprayers, and tow-behind rigs protects your financial investment and keeps spring projects on schedule. Equipped with the right supplies, winterizing your wash and spray gear is a straightforward afternoon task that guarantees reliable operation come spring.

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Why Winterization Protects Farm Equipment

Freeze damage happens silently inside unheated sheds and barns. A single sub-zero night can shatter plastic spray manifolds, split brass pressure valves, and warp internal pump housings. Water trapped inside tight tolerances expands by roughly nine percent as it freezes, exerting incredible pressure that destroys cast metal and rigid plastic components alike.

Chemical residues compound the problem if left inside equipment over the winter. Pesticides, liquid fertilizers, and hard water minerals settle out of suspension, corroding internal springs and hardening into crusty deposits. These deposits ruin pump seals and clog delicate nozzle tips long before the next season starts.

Taking an hour to clear and preserve your spraying and washing gear prevents costly mid-season breakdowns. It eliminates the frustration of pulling out damaged equipment during the busy spring setup window. Proper winterization is the single cheapest insurance policy available for small-farm power equipment.

Pump Saver – Briggs & Stratton Pump Saver

High-pressure washer pumps contain precision pistons, check valves, and rubber seals that are vulnerable to both ice and dry rot. Briggs & Stratton Pump Saver delivers an anti-freeze and lubricant formula designed to coat internal chambers. It displaces residual water while leaving behind a protective film that stops mineral buildup and prevents seals from drying out during months of storage.

This formula comes in a convenient bottle with a threaded top that connects directly to any standard 3/4-inch garden hose inlet. Using it requires no complex tools or teardowns. You simply attach the bottle to the pump inlet, turn the valve, and pull the engine starter cord until foam exits the discharge outlet.

• Key Feature: Threaded garden hose adapter for direct pump attachment
• Protection Level: Anti-freeze protection combined with seal-lubricating oil
• Compatibility: Fits gas and electric pressure washers with standard garden hose inlets

This product is essential for anyone storing a cold-water pressure washer in an unheated space. It is not designed for broad-acre spray tanks or low-pressure diaphragm pumps, which require volume liquid flushes instead.

RV Antifreeze – Camco Premium Antifreeze

Clearing water out of tow-behind agricultural sprayers and utility rigs requires a liquid displacement solution that will not harm crops or degrade pump seals. Camco Premium RV & Marine Antifreeze protects plumbing lines down to -50°F using plant-safe propylene glycol. Unlike toxic automotive glycol, this formulation preserves internal rubber seals and won’t poison farm soil when flushed out in spring.

The bright pink color makes it easy to track through translucent spray lines and clear filter bowls. You know the system is protected the moment vibrant pink liquid flows evenly from every nozzle tip. Because it comes pre-mixed, you can pour it straight from the jug into empty sprayer tanks without metering.

• Key Feature: Propylene glycol formula safe for equipment seals and indirect soil contact
• Freeze Rating: Burst protection down to -50°F
• Application: Ready-to-use liquid without water dilution required

This is the standard choice for winterizing ATV spot sprayers, backpack units, and trailing orchard rigs. It is not suitable for engine cooling systems, which demand high-temp automotive ethylene glycol formulations.

Tank Cleaner – Nutra-Sol Sprayer Cleaner

Leaving pesticide and chemical residues in a sprayer tank over winter degrades pump diaphragms and risks cross-contaminating sensitive spring crops. Nutra-Sol Sprayer Cleaner neutralizes harsh chemical residues, removes scale, and strips oily chemical films from tank walls. It cleans deep into internal supply lines that rinsing with plain water cannot reach.

This dry powder dissolves quickly in water to create a high-pH washing solution. Circulating it through the pump and boom lines before winter storage strips away chemical crusts that would otherwise harden into line-blocking flakes. It also protects brass fittings from acid-based chemical pitting over long storage periods.

• Key Feature: High-strength powder chemically neutralizes active spray compounds
• Surface Safety: Non-corrosive to fiberglass, polyethylene, and brass
• Target Residues: Dissolves herbicide residues, liquid lime, and iron traces

This cleaner is necessary for any grower who applies herbicides, fungicides, or complex fertilizer blends through their equipment. Farms that run strictly fresh water through clean-out rigs can skip this step, but chemical sprayers require it.

Fuel Stabilizer – Sta-Bil Storage Formula

Gasoline containing ethanol breaks down in as little as thirty days, absorbing atmospheric moisture and forming gummy varnish in carburetor passages. Sta-Bil Storage Fuel Stabilizer binds to fuel molecules, preventing ethanol phase separation and stopping fuel oxidation for up to 24 months. It ensures gas-powered pressure washers start on the first pull after winter storage.

The bottle features a built-in measuring chamber that allows precise dosing without extra measuring cups. Adding one ounce treats two and a half gallons of fuel, making it easy to proportion for small power-equipment tanks. It dissolves instantly in gas without requiring aggressive shaking or mixing.

• Key Feature: Prevents ethanol phase separation and varnish formation in small engines
• Dosage Rate: 1 oz treats 2.5 gallons of fresh fuel
• Storage Duration: Protects fuel systems for up to two full years

This stabilizer is vital for all four-stroke and two-stroke gas pressure washers heading into seasonal storage. It provides no benefit to electric pressure washers or battery-operated spray units.

Blowout Plug – Camco Brass Waterline Plug

Using compressed air to blow standing water out of pump chambers and supply lines is a foolproof way to eliminate freeze risks. Camco Brass Waterline Plug threads directly into standard 3/4-inch female hose connections, providing a secure air-tight fitting. It features a standard Schrader air valve stem that connects to any common tire inflator or air compressor hose chuck.

Constructed from solid brass, this small adapter resists thread stripping and corrosion from wet air lines. Blowing low-pressure air through wands and plumbing manifolds purges low spots where water naturally pools. This process drastically reduces the volume of liquid antifreeze needed to protect larger spray rigs.

• Key Feature: Heavy-duty brass construction with integrated air valve stem
• Thread Pitch: Standard 3/4-inch garden hose thread
• Working Pressure: Designed for low-PSI air compressor purging

This plug is ideal for workshop owners who already maintain an air compressor and want an extra layer of dry-storage protection. It requires access to an air compressor and must be used with low air pressure to avoid damaging internal pump check valves.

O-Ring Repair Kit – Craftsman Maintenance

Cold temperatures shrink aged rubber seals, causing small cracks that turn into leaks under high spring operating pressure. Craftsman Universal O-Ring Assortment contains chemical-resistant nitrile rubber rings sized for pressure washer wands, hose quick-connects, and sprayer spray tips. Replacing worn seals during fall teardown prevents frustrating pressure drops during spring setup.

Nitrile construction ensures these O-rings hold up against high water pressure, detergent soaps, and common oil-based spray adjuvants. The included organized plastic case keeps sizes segregated so you can match old seals quickly. Replacing damaged rings before storing equipment prevents metal fittings from seizing together over the winter.

• Key Feature: Chemical-resistant nitrile rubber built for high-pressure spray gear
• Variety: Multiple standard sizes for wands, nozzles, and quick-connect couplers
• Storage: Compact compartmentalized case keeps sizes labeled and organized

This kit is a smart purchase for anyone maintaining multiple spray wands, quick-disconnect fittings, or multi-nozzle spray booms. It will not fix internal pump piston seals, which require model-specific rebuild kits.

Equipment Cover – Classic Accessories Cover

Dust, rodent droppings, and damp air from barn rafters degrade electrical switches, rot starter cords, and corrode exposed metal frames. Classic Accessories Heavy-Duty Pressure Washer Cover wraps around medium-to-large cart systems to keep atmospheric moisture out. The heavy fabric resists cracking in extreme sub-zero cold while shielding components from ambient shop dirt.

An elastic hem cord along the bottom edge holds the cover tight against high winds when stored in open pole barns or carports. The fabric is water-repellent, preventing roof drips from pooling around engine spark plugs and air filters. Soft inner lining prevents scuffing on painted metal frames and plastic shrouds.

• Key Feature: Weatherproof fabric with elastic bottom cord for snug fit
• Protection: Shields against cold drafts, rain drips, dust, and UV exposure
• Sizing: Universal dimensions fit most gas and electric cart pressure washers

This cover is ideal for farm equipment parked in unheated outbuildings, lean-tos, or multi-use machine sheds. It is unnecessary if your machinery spends the off-season inside a sealed, climate-controlled workshop.

Hose Wrap – WrapIt Heavy Duty Storage Strap

Coiling pressure washer hoses and sprayer lines tightly around small equipment hooks creates sharp kinks that weaken internal reinforcement braid. WrapIt Heavy Duty Storage Strap uses marine-grade polypropylene webbing and industrial hook-and-loop fasteners to hold long hose loops securely. Hanging coiled hoses flat on wall hooks keeps water from pooling in low loops during winter storage.

The integrated weather-resistant grommet makes it easy to hang heavy rubber hoses directly on shop studs or pegboards. The wide strap distributes weight evenly, preventing deep indentations in soft outer hose jackets. It handles heavy, thick-walled rubber hoses with ease, keeping floor space clear of tripping hazards.

• Key Feature: Weatherproof polypropylene webbing with rustproof grommet
• Load Rating: Holds up to 50 pounds of coiled hose or cable
• Closure: High-tack hook-and-loop fastener rated for outdoor storage

This strap is great for organizing heavy-duty high-pressure hoses, long boom supply lines, and suction hoses. Equipment with functional, built-in hose reels won’t need these standalone straps.

Step-by-Step Guide to Draining Sprayers

Begin winterization by parking the sprayer on a level surface and draining the main tank completely into an approved collection container. Open the bottom drain valve and turn on the pump briefly to push residual liquid out of the main sump. Never leave standing liquid in the bottom of polyethylene tanks, as freezing ice can crack structural mounting points.

Next, remove all suction strainers, inline line filters, and individual nozzle tip assemblies. Rinse these small parts in clean water, dry them off, and store them in a small sealed container filled with RV antifreeze or light oil. Removing nozzles prevents trapped water behind tip screens from freezing and cracking the plastic nozzle bodies.

Connect an air compressor set to no more than 20 PSI to the main suction line using a blowout plug. Open each boom valve and trigger hand wands one by one, allowing compressed air to drive trapped water out of all drop lines and hose fittings. Keep the air running until only a fine mist exits the nozzles.

Finally, pour 1 to 2 gallons of non-toxic RV antifreeze directly into the empty tank. Turn the pump on and open each spray section until pink fluid flows clearly from every valve and wand tip. This confirms that all internal pump cavities, pressure regulators, and supply lines are fully charged with freeze protection fluid.

Safe Storage Tips for Freeze Protection

• Elevate equipment off bare dirt or damp concrete floors using wooden pallets or thick rubber stall mats.
• Disconnect all quick-coupling wands, high-pressure hoses, and intake lines to prevent trapped water in joint fittings.
• Store electronic display heads, spray controllers, and removable lithium batteries inside a heated home or shop.
• Keep hose coils hung loosely on broad wall hooks to prevent deep kinks and cold-weather memory set.

Elevating equipment off cold concrete floors prevents ground moisture from rusting bottom frame rails and pump mounts. Storing delicate electronics indoors protects sensitive liquid crystal displays and internal circuit boards from extreme cold damage. These simple precautions extend the operational life of expensive sprayer accessories by years.

Preparing Your Washers for Spring Startup

Start spring prep with a thorough visual inspection of all rubber hoses, plastic fittings, and electrical wiring before applying power. Look closely for signs of rodent chewing on high-pressure hose jackets, cracked filter bowls, or loose hose clamps. Inspect internal pump sight glasses on pressure washers to verify oil levels are correct and free of white, milky moisture contamination.

Flush all stored RV antifreeze out of supply lines before attaching fine-spray tips or chemical nozzles. Connect a fresh water supply to the pump inlet, point wands into a catch bucket, and flush the system clear for two minutes. Catching the initial discharge prevents residual antifreeze from staining gravel drives or spraying onto young crop foliage.

On gas-powered units, check the engine oil level and verify that fresh fuel is flowing through the carburetor. Start the engine with the spray wand open to release backpressure on the pump during cranking. Let the unit idle at low speed for a few minutes to warm up and check all pressurized fittings for hairline leaks before cranked up to full working capacity.

Taking the time to properly drain, flush, and protect your pressure washer and sprayers pays off immediately when warm weather returns. With high-quality anti-freeze, clean fuel, and clear lines, your equipment will fire up smoothly and hit full pressure on the first busy spring day.