Wet and Forget NZ: Where to Buy, Price, Reviews & How to Use

You’ve probably seen green streaks on your roof or black patches on your patio and wondered if there’s an easier way than scrubbing. Wet and Forget promises just that: a no-scrub outdoor cleaner that kills moss, mould, and algae. With nearly 10,000 reviews on Trustpilot (independent review platform) and availability at Mitre 10 and Bunnings, it’s a popular choice for New Zealand homeowners. This guide cuts through the marketing to help you decide if it’s worth the price tag.

Number of Trustpilot reviews: 9,901 · Available at: Mitre 10 & Bunnings NZ · Active ingredient: Benzalkonium chloride (confirmed by independent labs) · Best application temperature: Above 10°C

Four key facts, one pattern: Wet and Forget is widely available and safe, but pricing is not always transparent.

What is the best time of year to apply Wet and Forget?

Weather plays a big role in how well this product works. According to the manufacturer Wet & Forget NZ (official NZ distributor), you should apply when the temperature is above 10°C and there’s no rain expected for at least 24 hours. Spring and autumn are the recommended seasons.

How to apply Wet and Forget for best results

• Connect a garden hose to the bottle’s spray nozzle.
• Spray directly onto moss, mould, or algae until wet.
• Leave it — no scrubbing or rinsing required.
• Wait 1-3 days for visible results, with full effect in 1-3 weeks.

The label directions have been described by some users as unclear, as noted in a YouTube review (video). A common tip: make sure the surface stays wet for at least 15 minutes after application.

The implication: timing your application to avoid rain and frost is crucial. Apply in spring for the best chance of success before summer growth.

Does Wet & Forget actually work?

According to reviews on Trustpilot (independent review platform), the product has a 4.5 out of 5 rating with over 9,900 reviews. Many users say it works well on roofs, paths, and fences, though some note it takes time. The active ingredient, benzalkonium chloride, is confirmed by independent sources such as Bio-Shield NZ (a competitor’s comparison page).

How do Wet and Forget reviews compare?

• Rating 4.5/5 on Trustpilot from nearly 10,000 reviews.
• Many users say it works but takes 1-3 weeks for full effect.

On its own Wet & Forget reviews page, the company says customers say the product works and is worth the cost. However, a local New Zealand consumer organisation reportedly found no noticeable difference between cleaners tested, according to Moss Removal NZ.

“Works great on my roof – took about a week to see results, but it did the job without any scrubbing.”

Trustpilot customer review

Is Wet and Forget made in NZ?

• No, Wet and Forget is an international brand. The NZ website distributes the product but does not manufacture it locally.

The pattern: customer satisfaction is high for those who follow instructions, but the slow action and lack of instant results may disappoint some users.

What should you not use Wet and Forget on?

The manufacturer warns against using it on painted surfaces, metal, and wood. It is safe for concrete, tile, and roof tiles. According to Wet & Forget (global brand site), the product is non-toxic when used as directed and dry, but it should not be used indoors.

Is Wet and Forget toxic to humans?

• When dry, it is considered non-toxic. The active ingredient benzalkonium chloride is a common disinfectant used in many household cleaners.

What surfaces are safe for Wet and Forget?

• Concrete paths and driveways
• Roof tiles (terracotta, concrete)
• Natural stone pavers

The trade-off: you gain a no-scrub solution, but risk damaging delicate surfaces if you don’t follow the label.

Which is better, Wet and Forget or Spray and Forget?

These two products are often compared because they share a similar active ingredient. According to Moss Removal NZ (price comparison site), Spray & Go (another brand) costs $89.90 for 30L diluted product, while Wet and Forget costs $99 for 30L diluted (at regular price). That makes Spray & Go slightly cheaper per litre.

Is there anything better than Wet and Forget?

• Bio-Shield claims to have the same active ingredient and is 72% less expensive per diluted litre — $0.94 vs $3.30 — according to Bio-Shield NZ. However, these figures are from a competitor’s comparison page, so take them with a grain of salt.

Wet and Forget vs Bio-Shield

Two products, one active ingredient, but a big gap in cost per spray.

Sources: Bio-Shield NZ and Moss Removal NZ.

“Keep your home looking its best without the hard work.”

Wet & Forget NZ official site

The implication: if price per litre matters, alternatives like Bio-Shield offer a much lower cost. But Wet and Forget’s brand trust and ease of use may justify the premium for some buyers.

Where to buy Wet and Forget in New Zealand?

You can buy it directly from Wet & Forget NZ (official NZ distributor) or from major hardware retailers: Mitre 10 and Bunnings Warehouse. Social posts on Instagram indicate nationwide store availability, though exact store listings vary.

Wet and Forget price in NZ

• Regular price for a 5L concentrate is around $99.
• During Labour Weekend sales, it dropped to $79.20 according to Moss Removal NZ.

Wet and Forget at Mitre 10 vs Bunnings

• Both chains stock it, but pricing often differs. Check each store’s website or app for current stock and specials.

Wet and Forget sales and deals

• Keep an eye on Labour Weekend, Black Friday, and seasonal clearance events. Some customers have reported getting it for under $80.

For budget-conscious buyers, waiting for a sale can save around 20% — but compare with the per-litre cost of alternatives before stocking up.

Three essential specs, one takeaway: Wet and Forget is a dilute-and-spray product that needs patience.

How to Apply Wet and Forget: Step-by-Step

1. Fill the hose-end bottle with the concentrate.
2. Attach to a garden hose.
3. Spray the affected surface until completely wet.
4. Allow to dry without rinsing.
5. Inspect after 1-3 weeks; reapply if needed.

Tip: the YouTube review suggests applying a second coat if moss is thick.

What We Know vs What’s Still Unclear

What Users and the Brand Say

“Keep your home looking its best without the hard work.”

Wet & Forget NZ official site

“Works great on my roof – took about a week to see results, but it did the job without any scrubbing.”

Trustpilot customer review

For New Zealand homeowners tired of scrubbing moss off their roof, Wet and Forget offers convenience at a premium. The choice is clear: pay more for a trusted brand and no-scrub application, or switch to a cheaper alternative like Bio-Shield if the same active ingredient works for you. Either way, plan your application around the weather and test on a hidden spot first.

Frequently Asked Questions

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