Under Carriage Cleaners

Road salt does not quit when winter ends. It sits in frame rails and rocker panels eating metal until somebody rinses it out. An undercarriage cleaner rolls under the vehicle on casters and blasts the underside clean while you stand upright and dry. We carry everything from an $85 under car water broom to 21 inch Mosmatic stainless rotary arms for fleet work. Call 301-519-9274 if you want help picking the right one for your machine.

Choosing an Undercarriage Cleaner for Your Pressure Washer

Two designs dominate this category. Fixed-nozzle water brooms put a row of nozzles on a wheeled bar, cost the least, and clean a stripe as wide as the bar on every pass. Rotary undercarriage cleaners spin a nozzle arm under a covered deck, the same principle as a surface cleaner, and scrub a full circle of coverage with overlapping passes. The rotary units cost more because the swivel and bearings live in a brutal environment, upside down in salt spray. That is why the serious ones are stainless.

Match It to Your Machine

These attachments want flow more than raw pressure. Plan on 2,500 PSI or better and at least 3 GPM for the multi-nozzle units, since every added nozzle splits your flow. Most cold water contractor machines in the 4 GPM class run any unit on this page. Check your ground clearance too. A 21 inch deck needs roughly 9 inches under the rocker panels, which covers trucks, vans, and most SUVs. For lowered cars, a slim water broom is the safer reach.

Compare Models

The 16 inch water broom is on the shelf as this page goes up. The Mosmatic and Centurion units move in and out fast, so call for current availability before you drive over.

Using One Without Wrecking Anything

Keep the nozzles 6 to 8 inches off the underbody where you can, and slow down around brake lines, wiring looms, and fuel lines. High pressure at point-blank range can cut a rubber brake hose. Work front to back so debris washes out behind you, hit the wheel wells separately, and finish with a low-pressure rinse. For salt season, plain water removes most of it, but a salt neutralizer from our fleet wash chemicals pulls chlorides out of seams that water misses.

From the Field

Our undercarriage business spikes every March when Maryland fleet managers see what a winter of Route 270 brine did to their trucks. The buyers who get the most from these tools run them all season, not just in spring. A two minute underbody rinse at every wash keeps chlorides from ever settling in. One more tip from the counter. If you already own a pressure washer in the 4 to 5.5 GPM range and do flatwork too, the Centurion dual unit earns its price faster than a dedicated undercarriage tool, because it works driveways on the weekdays and fleet contracts on the weekend.

Related Collections

• Water brooms for flat surface rinsing
• Surface cleaners and surface cleaner parts
• Mosmatic equipment and Centurion tools
• Fleet wash chemicals and degreasers
• Pressure washer guns and lances
• Quick connects for fast attachment swaps
• Cold water pressure washers to power them

Want to see one before you buy? Visit the Sun Brite Supply store in Gaithersburg.

Frequently Asked Questions

What size pressure washer do I need for an undercarriage cleaner?

Aim for 2,500 PSI or more and at least 3 GPM. Multi-nozzle rotary units split your flow across several orifices, so a 4 GPM machine is the comfortable match for the 21 inch cleaners.

Will an undercarriage cleaner damage brake lines or wiring?

Not if you keep some distance. Hold the nozzles 6 to 8 inches from the underbody and move steadily past rubber hoses, sensors, and wiring looms. Blasting a fixed point at close range is what causes damage.

What is the difference between a water broom and a rotary undercarriage cleaner?

A water broom uses a fixed row of nozzles on a wheeled bar and cleans a straight stripe. A rotary cleaner spins a nozzle arm for overlapping circular coverage, cleans faster, and costs more because of the swivel and bearings.

Can one tool clean both driveways and undercarriages?

Yes. The Centurion 21 inch stainless unit converts between surface cleaning and undercarriage duty. For a contractor who does flatwork and fleet washing, one convertible tool beats buying two.

Does water alone remove road salt?

Water removes loose salt, but chlorides packed into seams and frame rails hang on. A salt neutralizing additive breaks the bond so the rinse actually carries it out. Regular rinsing through winter matters more than any single spring cleanup.

How much ground clearance does the vehicle need?

The 21 inch rotary units need roughly 9 inches under the lowest point. Trucks, vans, and SUVs clear that easily. For lowered passenger cars, use the slimmer 16 inch water broom.