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Searching for “best washers for RVs” lands you in an unusual category. The phrase covers three genuinely different product families that all serve the life of an RV owner: hardware washers used in building, mounting, and repairing components; compact laundry washers that fit in a garage bay or under a counter; and pressure or foam washers for cleaning the rig’s exterior after weeks on the road. The best choice depends entirely on which problem you are solving right now.
What separates a worthwhile purchase from a frustrating one is fit and durability. A hardware washer that corrodes within a season is worse than no washer at all. A portable washing machine that draws too much power for your inverter is a $250 disappointment. A pressure washer that cannot lift road grime from a slide-out seal wastes your weekend. This guide compares published specifications, listed prices, and recurring themes in owner feedback across eight products that show up repeatedly when RV owners search for washers in all three senses.
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Quick Picks
| Product | Best for | Price |
|---|---|---|
| WEGOUP 900 Pcs Stainless Steel Flat Washers | General hardware stock | $6.28 |
| Auertech Portable Washing Machine | Full laundry in an RV bay | $179.99 |
| HAVA Portable Washing Machine | Compact under-counter setup | $255 |
| VGBUY 28PCS 5/8 Flat Washers | Bolt-through mounting jobs | $7.49 |
| Car Wash Foam Gun with Microfiber Mitt | Gentle exterior cleaning | $32.99 |
| Greenworks 1800 PSI Electric Pressure Washer | Deep exterior cleaning | $125 |
| Bates Stainless Steel Fender Washers | Wide-load bolted connections | $8.85 |
| 1100 Pcs Flat Washers Assortment Kit | Metric hardware for foreign rigs | $6.99 |
How We Picked
We narrowed this list using four criteria. Material grade matters most for hardware washers—304 stainless resists the humidity and road salt that destroy zinc-plated fasteners over time. For laundry and cleaning machines, power draw and capacity must be realistic for typical RV electrical systems, meaning we prioritized units that run on standard 120V circuits without requiring a generator at full load. Price-to-count ratio is the practical measure for hardware kits, since owners rarely use more than a few washers from a bulk pack before the rest sit in a drawer. Finally, we flagged products with recurring owner complaints about fit, premature failure, or misleading capacity claims.
The 8 Best Washers For Rvs in 2026
WEGOUP 900 Pcs Stainless Steel Flat Washers for Screws, Assorted Sizes
This kit is the default answer for RV owners who do their own accessory installs—mounting solar brackets, securing LED strips, attaching cargo racks. The 900-piece count across assorted sizes means you will almost certainly have the right inner diameter for whatever screw or bolt you are working with. Owners highlight the organized compartment storage case as a genuine quality-of-life feature in a small workspace. The 304 stainless construction handles the moisture and temperature swings inside a rig better than plated alternatives.
- Huge variety of sizes in one purchase eliminates mid-project trips to the hardware store
- Stainless material resists corrosion from condensation and humidity inside RV cabinets
- Some individual washers are thin enough to deform under high-torque fastening
Skip this if you only ever need one size of washer—buy a single pack and save space.
Auertech Portable Washing Machine, 28lbs Twin Tub Washer Mini Compact Laundry Machine with Drain Pump, Semi-automatic 18lbs Washer 10lbs Spinner Combo for Dorms, Apartments, RVs
The Auertech twin-tub is the most capable laundry option on this list for an RV garage bay. The 18-pound wash tub handles a weekend load for two travelers, and the separate 10-pound spinner brings clothes out damp but not soaking. The built-in drain pump is the critical spec here: it eliminates the need to siphon water by hand or position the unit below a drain, which is a serious constraint in a vehicle with no plumbing hookups. At under $180 it undercuts every competitor in capacity per dollar.
- Semi-automatic operation means you control fill and drain timing, useful for water conservation on dry camping
- Drain pump lets you discharge through a window or under a cabinet without elevation
- Spinner cycle is shorter than a full-size machine, so heavily loaded items may still feel damp after one spin
Skip this if you only wash small items like socks and underwear—a simpler top-loader with a smaller footprint fits better.
HAVA Portable Washing Machine 0.8 Cu. Ft. Capacity Mini Washer & Spin Dryer
The HAVA sits in a middle ground: more finished than a bucket washer but smaller than the Auertech twin-tub. Its 0.8 cubic foot capacity suits a single traveler or couple doing a quick load between destinations. Owners who have installed it in fifth-wheel laundry closets note the compact footprint and the fact that it fits under standard RV counters. The spin-dry cycle reduces drying time noticeably compared to wringing by hand.
- Full automatic cycle means you set it and walk away, useful during a campsite setup window
- Compact dimensions allow installation in factory-designed RV laundry spaces without modification
- Capacity is limiting for families—two nights of children’s clothing can fill the tub
Skip this if you camp with more than two people or prefer larger batch washing to conserve water.
VGBUY 28PCS 5/8 Flat Washers for Screws and Bolts, 1-1/2 OD, Thickened 304 Stainless Steel 5/8 Washer Flat, Large Hardware Washers for Home, Industry, Indoor and Outdoor Use
When you are bolting a bike rack, ladder, or stabilizer pad to the side of an RV, a standard washer spreads load poorly and can gall into soft aluminum framing. The VGBUY 5/8 inch washers with their 1-1/2 inch outer diameter provide genuine clamping surface area. The thickened 304 stainless gauge resists deformation under torque. Twenty-eight pieces is enough for most single projects without the bulk of a kit you will never finish.
- Wide OD distributes clamping force over a larger area, reducing pull-through risk in thin metal
- Thickened profile maintains flat seating even after repeated bolt tightening and removal
- Single-size pack means you need to buy multiple kits if your project uses different bolt diameters
Skip this if your mounts use bolts smaller than 5/8 inch—these will slide right off.
Car Wash Foam Gun for Garden Hose, with Microfiber Wash Mitt, Foam Sprayer
The foam gun is the gentle option for exterior cleaning. RV owners who wash their rigs at a campsite spigot without a power connection gravitate toward this tool because it runs on household water pressure alone. The included microfiber mitt pairs well with the lubricating foam for a contact wash that lifts dirt without scratching clear coats or decals. On a budget of roughly $33 you get both the applicator and the soap solution delivery in one package.
- No electrical requirement means you can wash anywhere with a hose bib, including boondocking sites
- Foam acts as a lubricant layer, reducing swirl marks compared to sponge-and-bucket methods
- Hose pressure alone will not remove caked-on road salt or bug residue from a long trip
Skip this if your rig accumulates heavy grime between washes—a pressure washer will handle it in half the time.
Greenworks 1800 PSI (1.1 GPM) Electric Pressure Washer PWMA Certified
At 1800 PSI and 1.1 gallons per minute, the Greenworks sits in the sweet spot for RV owners who want real cleaning power without the weight or noise of a gas unit. It plugs into a standard 120V outlet, which means a campground hookup or a generator rated above 1500 watts will run it. PWMA certification adds a layer of performance verification that generic units lack. Owners regularly report that it removes algae streaks from roof seams and road film from fiberglass sides effectively.
- Electric motor starts instantly with no pull-cord or fuel mixing, which matters when you wash at a campsite at 7 AM
- 1800 PSI is aggressive enough for most RV exterior cleaning without risking seal damage at proper distance
- 1.1 GPM flow rate means you will not strip soap as fast as higher-volume units, so pre-soak matters more
Skip this if your rig is parked in a spot with only 30-amp service shared with an air conditioner running—check your available amperage first.
Bates- Stainless Steel Fender Washers, 1/2″ x 2″, 20 pcs, Large Washer Fender, 1/2 Washers Flat Washer
Fender washers serve a specific job: securing a 1/2 inch bolt through a large hole or soft material where a standard washer would pull through the substrate. RV owners use them when anchoring awning arms to siding, bolting receiver mounts to wall framing, or clamping anything to plywood backing where the hole is oversized. The two-inch outer diameter with stainless construction makes them last well outdoors. Twenty pieces is a practical quantity for a project without dead stock.
- Two-inch outer diameter prevents pull-through in soft materials like plywood, foam insulation, or composite siding
- Stainless steel will not stain surrounding fiberglass or aluminum after years of rain exposure
- Twenty-piece count may fall short if you are securing multiple large mounts across a full-length RV
Skip this if your bolt hole is tight and properly sized—a standard flat washer is cheaper and lighter.
1100 Pcs Flat Washers Assortment Kit – 304 Stainless Steel, 9 Metric Sizes (M2–M12), Metal Washers for Screws and Bolts – Ideal for Automotive, Construction, Industrial, and DIY Use
European-built RVs and trailers like Hymer, Carthago, and many towables use metric hardware throughout. A standard imperial washer kit leaves you without the correct fit. This assortment covers M2 through M12 across nine sizes in 304 stainless, making it the logical choice for owners of imported rigs or anyone working on metric accessories like bike racks and roof-mount antenna bases. The 1100-piece count is the largest on this list.
- Metric range eliminates the common problem of using an imperial washer on a bolt that is slightly too tight or too loose for proper seating
- 1100 pieces across nine sizes means the kit covers nearly every bolt diameter encountered in RV accessory work
- Owners with exclusively domestic RVs may find the metric range unnecessary for most tasks
Skip this if your rig is entirely US-built and you have never handled a metric bolt—standard hardware is simpler.
Buying Guide
Material Grade and Corrosion Resistance
For hardware washers used in or on an RV, the material determines whether the fastener remains serviceable after years of vibration and humidity. 304 stainless is the practical minimum. Zinc-plated carbon steel may look identical on a store shelf but will develop rust streaks within one season in a marine or desert environment. When comparing kits, confirm the stainless grade is stated explicitly—some products say “stainless” without specifying the alloy, which can mean a less corrosion-resistant variant.
Electrical Load and Water Capacity for Laundry Machines
An RV laundry machine must match your electrical system. A 120V unit drawing 10 to 12 amps will trip a 30-amp circuit if your air conditioner or microwave is running simultaneously. Check the listed amperage and compare it against your available breaker capacity after accounting for other loads. Water capacity works the same way in reverse: a larger tub uses more fresh water per cycle, which matters when you are not connected to a full hookup and are limited to your tank supply.
Cleaning Equipment Pressure and Flow Rate
For exterior washers, the combination of pressure (PSI) and flow rate (GPM) determines cleaning power. High PSI with low GPM will etch into sealant without carrying the loosened dirt away. For RV cleaning specifically, 1500 to 2000 PSI at one gallon per minute or slightly above hits the point where road grime lifts but rubber seals and decals remain intact. Electric units in this range are adequate for most owners; gas-powered options add unnecessary weight and complexity for a vehicle you are already transporting.
Our Verdict
The Greenworks 1800 PSI Electric Pressure Washer is the top pick for the largest number of RV owners because exterior cleaning is the most frequent washer-related task, and no other product on this list handles road film, algae, and bug splatter in a single afternoon. For hardware work, the WEGOUP 900-piece kit delivers the best value per usable piece and covers the widest range of bolt sizes encountered in accessory installs. If your primary need is laundry and you have a generator or full hookups, the Auertech twin-tub wins on capacity-per-dollar. But if you only camp domestically and your rig sees moderate dirt, the Greenworks earns its place in your garage over every other option here.
FAQ
What size washers do I need for an RV bike rack mount?
Most bike rack receiver mounts use 1/2 inch or 9/16 inch bolts, so a flat washer with that inner diameter and a 1-1/2 inch or larger outer diameter will provide proper clamping surface. Fender washers like the Bates 1/2 x 2 inch are ideal when the mounting surface is plywood or thin aluminum siding that could deform under standard washer loads.
Can a portable washing machine fit in a travel trailer closet?
Units like the HAVA at 0.8 cubic feet are designed to fit standard RV laundry closet dimensions, which typically offer around 24 inches of width and depth. Larger twin-tub models like the Auertech require more floor space and work better in a garage bay or under a dinette seat. Measure your available space and door swing before purchasing.
Is 1800 PSI enough pressure to clean an RV exterior?
Yes, 1800 PSI is sufficient for routine RV washing, including roof panels, sidewalls, and wheels. The key is maintaining a distance of at least 12 to 18 inches from sealants and decals. Higher pressure units can damage those components if used too close, so the Greenworks sits at a practical ceiling for RV-specific cleaning.
Do metric washers work on American RV hardware?
No—metric inner diameters are sized for metric bolts, and forcing a metric washer onto an SAE bolt (or vice versa) creates a sloppy fit that cannot transfer clamping load properly. However, many imported RVs, trailers, and accessories use metric fasteners throughout, so having a metric assortment on hand is worthwhile even for owners of domestic rigs who buy aftermarket European or Asian components.