Alfred Harper
Deck covered in green gloop? Find the pressure washer that blasts it back to life—safely.
Decks don’t clean themselves. I once stepped onto a decking board and came away with moss on my shoes. It’s a common, ugly problem and pressure washing is the fastest fix.
I tested machines from pro-grade German builds to cordless convenience. The right washer removes moss, algae and deep grime without shredding the wood. Here are the models that do that best.
Top Picks
Kre4nzle K 1152 TS T Professional Washer
I see the Kre4nzle K 1152 as a benchmark for durability, build quality and consistent performance. It’s designed for regular professional use and will outlast many domestic alternatives when correctly maintained.
Overview
In my assessment, the Kr e4nzle K 1152 TS T is a premium pressure washer aimed at professionals and serious users who demand superb longevity and steady performance. Its robust design makes it ideal for frequent cleaning of large decking areas and commercial sites.
Key features and benefits
Practical insights and limitations
I have found Kr e4nzle machines to be reliable with a reputational premium for maintenance intervals and parts quality. The trade-off is the initial price and weight — it is not the choice for occasional domestic use but will pay dividends through years of heavy service for tradespeople.
Who should buy it
I recommend this model to contractors, cleaning professionals and homeowners who want a premium, long-lived machine and are willing to invest in quality. For light domestic jobs it is likely over-specified.
Sealey PWM2500 Petrol 220 bar Heavy-Duty Washer
I find this petrol-powered Sealey an excellent choice for large-scale or commercial decking work where portability and sustained high pressure matter. It delivers strong flow and pressure that significantly cut cleaning time on stubborn surfaces.
Overview
I regard the Sealey PWM2500 as a robust petrol-powered pressure washer aimed at commercial or heavy domestic users. Its high pressure and flow rate make it ideal for tackling large decks, concrete patio areas and commercial sites where speed and power are priorities.
Key features and benefits
Practical insights and limitations
In my use, the petrol engine offers sustained power that electric machines struggle to match, making it faster for large-scale jobs. However, you must plan for fuel logistics, noise, vibration and periodic engine servicing; it is not the quiet, low-maintenance option that domestic electrics provide.
Who should buy it
I recommend the PWM2500 to tradespeople, facilities teams and homeowners with very large decks or frequent heavy cleaning needs who require portable, high-pressure performance that electric units cannot sustain.
Greenworks 3000 PSI Brushless Electric Washer
I find this Greenworks 3000 PSI unit strikes a very good balance between power and convenience, delivering near-gas performance in an electric package. It is especially effective at removing moss, algae and heavier grime from decking without the fuss of petrol engines.
Overview
I regard the Greenworks 3000 PSI as a top-tier electric pressure washer for homeowners who want professional-calibre cleaning without petrol fumes. Its brushless motor and high PSI/GPM figures make it a strong performer on decking, siding and fences.
Key features and benefits
Practical insights and limitations
In use, I noticed it cuts through algae and stubborn dirt much faster than entry-level electrics, which saves time and reduces the need for excessive pressure on wood boards. However, it's heavier and takes more storage space, and it needs mains power — so it’s less suitable for remote sites without electricity.
Who should buy it
I recommend it to homeowners with medium-to-large decks who want an electric machine that performs like a small petrol washer. It’s an excellent choice if you want strong cleaning power combined with quieter, emission-free operation.
Ke4rcher K5 Power Control Car & Home Washer
I find the Ke4rcher K5 a very versatile and user-friendly machine with selectable pressure settings that help protect decking while removing stubborn grime. It’s a great balance of features, performance and trusted brand support.
Overview
I regard the K e4rcher K5 Power Control as a top choice for homeowners who want flexibility and proven engineering. It’s designed to clean cars, patios and decking with selectable pressure settings that reduce the risk of damaging wood.
Key features and benefits
Practical insights and limitations
From my trials, the K5 cleans effectively without the intimidation of a single high-pressure setting; the ability to dial pressure down is particularly useful for older softwood decks. It is not the cheapest option, but the combination of versatility and brand reliability justifies the price for many owners.
Who should buy it
I recommend the K5 for anyone who wants a reliable, feature-rich electric washer with the flexibility to protect different surfaces. It is well-suited to mixed-use households with cars, decking and patios.
Sealey PW2000HW Hot/Cold Water Pressure Washer
I value the hot-water capability for its effectiveness against oil, grease and deep-seated grime; this Sealey model suits more intensive cleaning requirements. It is heavier and more complex, but offers cleaning results that cold-water units cannot match on certain stains.
Overview
I consider the Sealey PW2000HW an excellent choice where hot-water cleaning is required — for example, decks contaminated with oil, food grease or industrial deposits. Hot water significantly improves cleaning effectiveness on certain stains that cold water struggles with.
Key features and benefits
Practical insights and limitations
I have observed that hot-water washers require more careful handling, maintenance and space; they are heavier and need fuel or electrical systems to generate heat. They are highly effective where chemistry alone fails, but for most routine moss and light dirt removal a cold-water electric may be sufficient and simpler.
Who should buy it
I recommend this model to users who regularly face greasy or industrial-style fouling on decking and equipment, or small businesses that need deeper cleaning capability than cold-water units can provide.
Nilfisk MC 2C Cold Water Commercial Washer
I consider this Nilfisk a robust, professional-grade cold-water washer suitable for frequent, heavy-duty use. It offers build quality and reliability aimed at commercial users and demanding home projects.
Overview
I view the Nilfisk MC 2C as a commercial cold-water pressure washer built to withstand regular, heavy use. Nilfisk targets professionals and serious DIYers who need dependable performance and longevity rather than compact convenience.
Key features and benefits
Practical insights and limitations
While the unit is powerful and long-lasting, that comes with trade-offs: it is heavier, more complex and more expensive than typical domestic machines. I would choose this model if I needed something to run all day on sites or to tackle very stubborn deposits on timber decking.
Who should buy it
I recommend this Nilfisk for trade users, contractors and homeowners with very large decks or frequent cleaning needs who value reliability and serviceability over low purchase cost.
Generac 8888 2700 PSI Residential Electric Washer
I found the Generac 8888 offers strong cleaning performance for a domestic electric washer, with a comfortable balance of pressure and usability. It is a good step-up for homeowners wanting more power without petrol maintenance.
Overview
I regard the Generac 8888 as a strong electric option that gives homeowners near-gasoline performance without the associated emissions and maintenance. It is well suited to medium decks, driveways and garden furniture.
Key features and benefits
Practical insights and limitations
In my experience, this unit is comfortable to use and handles tougher dirt far better than entry-level electrics. However, some owners reported intermittent reliability issues and required liaising with service centres, so warranty support and local service availability are important considerations.
Who should buy it
I recommend this model for homeowners who want a higher-performance electric washer for frequent use but prefer to avoid petrol engines. Check local service options and register warranty details when purchasing.
Sealey PW3500 Professional 140 bar Washer
I see the Sealey PW3500 as a capable mid-range professional unit that handles tough deck cleaning without the premium price of some trade machines. It is aimed at users who need more than a basic electric washer.
Overview
I find the Sealey PW3500 to be a sturdy, well-specced unit for homeowners and small tradespeople who need dependable cleaning power. Its 140 bar rating and induction motor design are aimed at more demanding domestic or light industrial tasks.
Key features and benefits
Practical insights and limitations
In my experience, this washer is a sensible bridge between domestic convenience and trade-level performance. It’s heavier than simple electric units, so you should consider storage and handling. Additionally, you may want to confirm local spare parts and service availability before purchase.
Who should buy it
I recommend the PW3500 for users who frequently tackle medium-to-tough cleaning jobs on decking and need a robust machine without stepping up to the highest-priced commercial models.
Greenworks 1800 PSI Compact Electric Washer
I found this model to be a very practical, lightweight unit that makes short work of light-to-moderate decking cleaning. It delivers good manoeuvrability and convenience for smaller jobs, especially where storage and portability matter.
Overview
I consider this Greenworks 1800 PSI unit an economical option for homeowners who need a compact electric washer for decking, garden furniture and patios. It is PWMA certified and designed to be simple to set up and store, which I appreciate when space is limited.
Key features and benefits
Practical insights and limitations
In my experience, this machine is best used on composite and softwood decks with surface dirt and mildew rather than heavily oil-stained or deeply ingrained grime. It’s easy to manoeuvre and assemble, but if you need higher pressure or a faster flow to remove old sealant or deeply embedded dirt, you will outgrow it quickly.
Who should buy it
I recommend it to owners of small to medium decks who prioritise portability and value. If you frequently tackle large or commercial-scale decking, consider a more powerful model; for occasional domestic work this unit is a sensible, budget-friendly choice.
Makita HW001GZ 40V XGT Cordless Pressure Washer
I appreciate the cordless freedom this Makita delivers for remote cleaning, but I encountered performance variability when self-priming from a tank and some durability concerns in long-duration use. It’s best when used from a mains-fed tap.
Overview
I value the Makita HW001GZ for its cordless design which makes it convenient for jobs away from a garden tap. It aims to provide mains-like washing power while being mobile thanks to the 40V XGT platform, though the lack of batteries in the package is an important consideration.
Key features and benefits
Practical insights and limitations
In practice I found that the machine performs best when connected to a stable tap—self-priming from storage containers is hit-and-miss and can slow work considerably. I also noted reports of electronic and nozzle wear after extended use; for professional or heavy daily tasks a mains or petrol machine may be preferable.
Who should buy it
I recommend this Makita for weekend DIYers and landscape professionals who need cordless convenience for occasional remote cleaning, but ensure you have the correct XGT batteries and be prepared for some limitations when priming from tanks.
Final Thoughts
I recommend two clear winners depending on how often and how hard you need to clean.
If you clean decks professionally or very often, go for the Kre4nzle. If you want strong results with easier ownership, go for the Greenworks.
Kränzle sounds amazing but I’m worried about the size and noise. For a homeowner who only cleans the deck twice a year, is it overkill compared to an electric Karcher or Greenworks?
I ended up buying the Greenworks 3000 PSI after reading this roundup and the foam cannon makes such a difference on my deck. Cuts through mildew way faster than my old pump sprayer.
Question for other users: do you dilute the soap or run it straight through the cannon? Also, any tips on nozzle angles for older softwood decking?
If your decking is sealed, test a tiny area first. I accidentally stripped finish once by using too concentrated soap ????