Best-Rated Outdoor Surface Cleaners

Compare Outdoor Cleaners in New Zealand at Canstar Blue. Wet & Forget, 30 Seconds and Simple Green were compared on Overall Satisfaction, Ease of Use, Effectiveness, Packaging and Value for Money.

See our Ratings Methodology.

Most Satisfied Customers | Wet & Forget

Kiwis rate Wet & Forget No.1 for keeping their outdoor areas slime-free and spotless.

 

 

How we rate outdoor surface cleaners

Our review compares outdoor surface cleaners on customer satisfaction, so you can discover what other Kiwis think about our compared outdoor cleaner brands before you go ahead and make a purchase. Think of it like asking hundreds of your closest friends and family which outdoor cleaner brand they think is best!


Canstar Blue surveyed 414 Kiwis who had purchased and used an outdoor surface cleaner in the last 12 months and asked for their feedback on the brand they bought.

  • The outcomes reported in these ratings are measured via accredited research panels managed by Qualtrics.

Respondents rate their satisfaction with their outdoor surface cleaner brands from zero to ten, where zero is extremely dissatisfied and ten is extremely satisfied. Brand satisfaction was rated by respondents on the following criteria:

  • Overall Satisfaction: measures consumer satisfaction with an outdoor surface cleaner brand as an individual score NOT a combined total of all criteria.
  • Value for Money: the cost is low for the quality and performance of the cleaner.
  • Effectiveness: the product effectively removes grime and built-up moss, mould and dirt.
  • Packaging: the packaging is informative and aids the cleaning solution’s application.
  • Ease of Use: the outdoor cleaner is easy to apply.

The winning brand is the one that receives the highest Overall Satisfaction rating once all the scores from the Overall Satisfaction criteria are combined and averaged.

  • Overall Satisfaction is asked as a specific question and represents an individual measure, not a combined total of all criteria.
  • When we cannot determine a clear winner from the criteria for the Overall Satisfaction rating, we will then look at the other criteria measured in the rating.
    • The brand with the highest number of five-star ratings within the supporting criteria will become the five-star recipient in overall satisfaction, and thus win the award. If a clear leader still cannot be determined from the supporting criteria, joint winners will be declared.

Brands must have received at least 30 responses to be included, so not all brands available in the market have been compared in this survey. The brands rated in this survey are listed below in order of best overall satisfaction.

  • Wet & Forget
  • 30 Seconds
  • Simple Green


Find more information on our Most Satisfied Customer methodology.

Best outdoor surface cleaners in New Zealand

  1. Wet & Forget
  2. 30 Seconds
  3. Simple Green

Wet & Forget

Ratings Results

For the second year in a row, Wet & Forget is the standout outdoor surface cleaner brand in our award ratings, as judged by Kiwi consumers. It’s the only outdoor surface cleaner to earn 5 Stars for Overall Satisfaction, a score it also achieves for the all-important category of Effectiveness, as well as for Ease of Use and Packaging. Wet and Forget takes home a great 4-star rating for Value for Money.

Editor’s Notes

Wet & Forget is an iconic brand that was founded here in New Zealand. Its range of cleaning products encompasses the whole home, from laundry to garden.

Wet & Forget currently retails four outdoor surface cleaners:

Wet & Forget Moss Mould Lichen & Algae Remover

The original Wet & Forget concentrate features a unique combination of biodegradable fungicides that target moss, mould, lichen, algae, and general biological growth. When diluted with water and applied to a dry surface, it immediately attacks the growth. The weathering process then continues to remove the decomposing growth over time.

  • Non-caustic, non-acidic and bleach free
  • Requires no scrubbing or water blasting
  • pH of 8 (water has a pH of 7)
  • Biodegradable
  • Helps prevent regrowth for up to a year

Rapid Application Moss Mould Lichen & Algae Remover

Wet & Forget’s Rapid Application product is a sister product to its original blue Wet and Forget Moss, Mould, Lichen & Algae Remover. While both products have the same active ingredients, Rapid Application Moss Mould Lichen & Algae Remover comes in a handy applicator spray bottle.

  • Non caustic and non acidic
  • No bleach, which gives it an endless shelf life
  • Safe to use on any exterior surface
  • Bottle automatically regulates the dilution rate for effortless spraying
  • Max reach of 8m

Double Bubble House Wash

Double Bubble House Wash easily dissolves dirt and grime on your paintwork, rather than moss, mould and lichen.

  • Max reach of 8m
  • Use once annually, as part of house maintenance
  • Can help double the lifespan of paintwork

Hit The Deck – Deck Cleaner

Hit The Deck Deck Cleaner is for cleaning dirty or blackened decks and other timber surfaces.

  • 60m² coverage
  • Designed to take most of the hard work out of heavy-duty cleaning on any softwood or hardwood decks, cedar weatherboards, fences, outdoor furniture, log cabins and pergolas

30 Seconds

Ratings Results

30 Seconds earns a great set of ratings from its customers across all categories, including a 4-Star rating for Overall Satisfaction. Given the brand’s budget-friendly pricing, it’s no surprise that one of its top scores is for Value for Money. Its other 5-star rating is for Ease of Use.

Editor’s Notes

30 Seconds’ home-cleaning products have been used in and around Kiwi homes for over 25 years. 30 Seconds has six outdoor surface cleaning products, which are available in a range of concentrate, ready-to-use, hose-applicator and hand- and motorised-spray packs.

Spray & Walk Away

The name says it all. All you do is apply, leave and allow the product to work over time to remove built-up lichen, moss, mould and algae on paths, roofs, brickwork and other hard surfaces.

  • No hosing or scrubbing required
  • Garden-safe phosphate- and bleach-free formula

Outdoor Cleaner

30 Seconds’ Outdoor Cleaner is suitable for use on all hard, exterior, washable surfaces – simply spray, scrub and rinse.

  • Works quickly
  • Suitable for wood, paint, concrete, brickwork, paving, terracotta, cloth and plastics
  • Ideal as a preparation for paint, varnish and stains

Roof & Awning Cleaner

Clean your roof and awnings without scrubbing or water-blasting. The cleaner works over time to remove lichen, moss, mould and algae.

  • Suitable for terracotta, slate, concrete and steel roofs, canvas, polycarbonate, vinyl awnings, synthetic tiles and shingles
  • Works with the weather to loosen and remove unwanted growth

Deck & Driveway Cleaner

Remove mould, dirt and grime from your deck or drive, also works on other outdoor wooden structures and furniture.

  • Suitable for cobblestones, concrete, metal surfaces, paving, tiles and wood

House Cleaner

For mild cleaning and restoring exterior home surfaces. Can help prolong the life of your home’s exterior paintwork.

  • Suitable for brick, masonry, metals, stucco and some woods (painted and unpainted)

House Wash

A milder home-cleaning product, suitable for removing light dirt and grime from exterior surfaces.

  • Suitable for brick, masonry, metals, stucco and all wood (painted and unpainted)

Simple Green

Ratings Results

Rounding out our awards table, Simple Green achieves 3-Star ratings across all categories, except Ease of Use, for which it earns a 5-Star rating. While 3 Stars is not a top rating, it is by no means a measure of dissatisfaction. Rather it indicates that Simple Green’s customers are happy with the levels of effectiveness and quality delivered by the brand’s products.

Editor’s Notes

Simple Green produces high-quality cleaning products with a focus on eco-friendliness. It has two outdoor cleaners in its range:

Outdoor Cleaner

Removes mould, dirt and grime from decks and driveways, also works on other outdoor wooden structures and furniture.

  • Biodegradable product designed to remove dirt, mould, mildew and moss
  • Helps prevent regrowth of moss and mould

Deck & Fence Cleaner

Suitable for all washable exterior surfaces, removes dirt, lichen, mould and mosses.

  • Non-toxic
  • Biodegradable and garden-friendly

Choosing the Right Outdoor Surface Cleaner for You

Whether you’re cleaning the entire exterior of your home, your driveway, or just one particularly slimy part of your deck, when it comes to your choice of cleaning product, one factor is paramount: its effectiveness.

In our survey, most respondents (39%) say the most important factor when rating their choice of outdoor cleaning product is how well it lives up to its cleaning promises.

Value for Money is also another important consideration, along with Ease of Use – each cited by just under a third of respondents (29%).

Packaging ranks at the bottom of the list of influencing factors (3%), which is a little surprising, as a lot of outdoor cleaners rely on their packaging (i.e. spray bottles) for optimum results and economy of use.

Here’s the full rundown of what the consumers in our survey say are the main things they consider when rating their outdoor surface cleaner choices:

  • Effectiveness: 39%
  • Value for Money: 29%
  • Ease of Use: 29%
  • Packaging: 3%


About the author of this page

Bruce Pitchers is Canstar NZ’s Content Manager. An experienced finance reporter, he has three decades’ experience as a journalist and has worked for major media companies in Australia, the UK and NZ, including ACP, Are Media, Bauer Media Group, Fairfax, Pacific Magazines, News Corp and TVNZ. As a freelancer, he has worked for The Australian Financial Review, the NZ Financial Markets Authority and major banks and investment companies on both sides of the Tasman.
In his role at Canstar, he has been a regular commentator in the NZ media, including on the DrivenStuff and One Roof websites, the NZ HeraldRadio NZ, and Newstalk ZB.
Away from Canstar, Bruce creates puzzles for magazines and newspapers, including Woman’s Day and New Idea. He is also the co-author of the murder-mystery puzzle book 5 Minute Murder.

More Information

Considerations when purchasing an outdoor surface cleaner:

Choose products that are environmentally friendly: 32%

Loyal to one brand of cleaner: 29%

Willing to pay more for a cleaner that comes with a better applicator: 26%

Canstar Blue surveyed 2503 New Zealand consumers across a range of categories to measure and track customer satisfaction, via ISO 26362 accredited research panels managed by Qualtrics. The outcomes reported are the results from respondents who had purchased and used an outdoor cleaner in the past 12 months. In this case, 459 New Zealanders.

Brands must have received at least 30 responses to be included. Results are comparative and it should be noted that brands receiving three stars have still achieved a satisfaction measure of at least six out of 10. Not all brands available in the market have been compared in this survey. The ratings table is first sorted by star ratings and then by mean overall satisfaction. A rated brand may receive a ‘N/A’ (Not Applicable) rating if it does not receive the minimum number of responses for that criterion.

The past winners from Canstar Blue’s Outdoor Surface Cleaner ratings:

  • 2024: Wet & Forget
  • 2022: 30 Seconds
  • 2021: 30 Seconds

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