---
product_id: 48157194
title: "Wet & Forget Mould, Lichen & Algae Remover, Outdoor Surface Cleaner, 5L"
brand: "wet & forget"
price: "S$111"
currency: SGD
in_stock: true
reviews_count: 13
category: "Wet & Forget"
url: https://www.desertcart.sg/products/48157194-wet-and-forget-mould-lichen-and-algae-remover-outdoor-surface
store_origin: SG
region: Singapore
---

# Long-lasting 12-18 months effect Bleach-free & eco-friendly 5L concentrated solution Wet & Forget Mould, Lichen & Algae Remover, Outdoor Surface Cleaner, 5L

**Brand:** wet & forget
**Price:** S$111
**Availability:** ✅ In Stock

## Summary

> 🌿 Spray, Forget, and Flaunt Your Spotless Outdoors!

## Quick Answers

- **What is this?** Wet & Forget Mould, Lichen & Algae Remover, Outdoor Surface Cleaner, 5L by wet & forget
- **How much does it cost?** S$111 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/48157194-wet-and-forget-mould-lichen-and-algae-remover-outdoor-surface)

## Best For

- wet & forget enthusiasts

## Why This Product

- Trusted wet & forget brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Gentle Yet Effective:** Bleach-free, nearly pH-neutral formula safe on diverse surfaces from solar panels to decking.
- • **Massive Coverage Power:** One bottle yields up to 30L of solution, covering 100-300m² of patios, roofs, and more.
- • **Versatile Surface Savior:** Perfect for patios, driveways, bricks, artificial grass, tarmac, and even headstones.
- • **Effortless Outdoor Renewal:** Spray once, no scrubbing or rinsing needed—just walk away and watch nature fade.
- • **Time-Tested Transformation:** Visible results develop gradually over months, ensuring deep, lasting mould and algae removal.

## Overview

Wet & Forget Mould, Lichen & Algae Remover is a powerful, bleach-free outdoor cleaner that requires no scrubbing or rinsing. Its highly concentrated 5L formula covers up to 300m² and works gradually over months to eliminate mould, algae, and black spots on a wide range of surfaces. Safe for use on patios, roofs, solar panels, and more, it offers a long-lasting, eco-friendly solution for maintaining pristine outdoor spaces with minimal effort.

## Description

Product Description Wet & Forget Mould, Lichen and Algae remover is the outdoor cleaning solution you’ve been looking for. Effectively remove contaminants with no water blasting or scrubbing required – simply apply to the surface and forget about it. Let Wet & Forget do the hard work for you. Our formula has an unlimited shelf life and is completely free from aggressive chemicals such as bleach and ammonia that can damage surfaces. No special equipment is needed for application. This simple approach means it is suitable for anyone to use. It can be used on ANY outdoor surface such as, roofs, bricks, natural stone, pavers, headstones, patios, driveways, paintwork glass houses, solar panels, tarmac, artificial grass and more. Wet & Forget also has a residual effect, the ingredients in the remover work to prevent premature recontamination helping to stop reoccurring mould growth. Ingredients Benzalkonium Chloride Directions Directions for Use • Mix one part Wet & Forget to five parts waters. Strength can be increased if contamination is more severe. • Saturate the DRY surface with mixture. We recommend application to be done first thing in the morning or on an evening and where rain is not forecasted in the 4-5 hours after application. • When rainfall begins, it works to wash away the contamination. • In some cases, re-application can be done 1-2 months after for persisting mould. Safety Warning Keep out of reach from children. Wear protective gloves and eye protection. If swallowed, call a poison centre, or seek medical advice. If the product encounters your skin or eyes, rinse thoroughly with water for several minutes. Dispose of contents/container is accordance with local legislation. This material and its container must be disposed of in a safe way. Use biocides safely. Always read the label and product information before use. To avoid risks to man and the environment, comply with the instructions for use. Safety Warning -Causes serious eye irritation. -Causes skin irritation. -Use biocides safely. Always read the label and product information before use. -Active Ingredient: Alkyl (C12-16) dimethylbenzyl ammonium chloride. -Very toxic to aquatic life. Box Contains One 5 Lt Bottle

Review: Simply wet and forget! - I used this in November 2024, yes that right and I am writing my review in May 2026. A whole 18 months later. Firstly those who thinks its cleaner like washing up liquid! Its not, you apply and leave it to work, you don't rinse it! Hence the name! Wet and Forget. On the container it even says results could take up to 6-12months. Do not expect results in hours, days or even weeks if they are stubborn! I spent a good 3 hours spraying it and noticed 3 months later that my back garden slab area looked less grimy, another 3 months and the front paving looked a little less grimy to now a whole 18 months later and the front paving is back to its original colours and you can clearly see the red/yellow/grey bricks. The back garden grey slabs looked bright and the crazy paving area no more moss. Like most I wasnt expecting a miracle but I am pleasantly surprised. If you havent the patience and want results fast then this is NOT the product you seek.
Review: Works well but give it time! - This is the second time I have purchased wet & forget and the results have been favourable in terms of eventually getting rid of algae, lichen and even moss for a period of time. I originally bought this to treat my block paving drive as I had what I'd described as white chewing gum stains and black spotty marks all over the area. I tried power washing and scrubbing with detergents but nothing seemed to work and then a friend advised to get wet & forget. I was a bit dubious it isn't a cheap option but I decided to give it a go and after 3-6 months I realised pretty much all the stains had gone! Now it certainly does not work overnight but I treated once and left (and genuinely fogot about it)... all the marks had gone, see attached pics of before and after treatment. Since then I have used my second container on my roof and even on a very old roof with high levels of moss growing. Here I did remove some of the moss with a plastic scrapper but the rest was down to spraying this product. It is so simple to do, just dilue 1 part wet & forget to 5 parts tap water, mix and then spray generously on the affected area. It is advisable to do this is dry conditions or when rain is not forecasted that day. Then wait, and over time you will see a difference. To conclude I am going to give this a full 5 stars it does actual work well. Only time will tell if it continues to work but in the case of my drive it remains clear of these marks after over a year+ period so I am genuinely happy with the results. It is not a cheap solution (there are lower cost alternatives which I have not used) but this one certainly delivers.

## Features

- Causes serious eye damage.
- Causes skin irritation.
- Use biocides safely. Always read the label and product information before use.
- Very toxic to aquatic life with long lasting effects.
- No Scrubbing Required: Simply mix 1 part Wet & Forget with 5 parts water, apply to the desired surface, and let it work its magic. No scrubbing, rinsing or jet washing required, just spray and walk away
- Highly Concentrated Formula: One bottle produces up to 30 litres of solution, covering a large area of 100-300m². Apply in cloudy, dry conditions for best results, ensuring at least 4-5 hours before any rainfall
- Versatile Application: Perfect for various surfaces, including patios, roofs, bricks, paving, artificial grass, tarmac, decking and more. Whether it's your driveway, headstones, or solar panels, Wet & Forget has you covered
- Softer Solution: Wet & Forget’s gentle, nearly pH-neutral formula is bleach-free making it safe to use on so many different outdoor surfaces
- Confidence in Every Spray: While our formula is gentle, we recommend wearing protective gloves and eye protection during use.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B005IW4GWI |
| Best Sellers Rank | 529 in Grocery ( See Top 100 in Grocery ) 2 in Mould Removers |
| Brand | Wet & Forget |
| Brand Name | Wet & Forget |
| Contains Liquid Contents? | Yes |
| Customer Reviews | 4.4 out of 5 stars 28,502 Reviews |
| Item Form | Liquid |
| Item Type Name | Mould Lichen & Algae Remover |
| Item Volume | 5 Litres |
| Item Weight | 5229 Grams |
| Item form | Liquid |
| Item volume | 5 Litres |
| Manufacturer | Wet & Forget Ltd |
| Material Features | Bleach Free |
| Material Type Free | Bleach Free |
| Material feature | Bleach Free |
| Model Number | WF5 |
| Number of Items | 1 |
| Part Number | WF5 |
| Product Warranty | Use biocides safely. Always read the label and product information before use, Active Ingredient: Benzalkonium Chloride |
| Scent | Unscented |
| Size | 5 l (Pack of 1) |
| Special Features | Biodegradable |
| Specific Uses For Product | Outdoor Surfaces |
| Specific uses for product | Outdoor Surfaces |
| Surface Recommendation | Floor |
| Unit Count | 5000.0 millilitre |

## Product Details

- **Brand:** Wet & Forget
- **Item form:** Liquid
- **Item volume:** 5 Litres
- **Material Type Free:** Bleach Free
- **Material feature:** Bleach Free
- **Scent:** Unscented
- **Special feature:** Biodegradable
- **Specific uses for product:** Outdoor Surfaces
- **Surface recommendation:** Floor
- **Unit count:** 5000.0 millilitre

## Images

![Wet & Forget Mould, Lichen & Algae Remover, Outdoor Surface Cleaner, 5L - Image 1](https://m.media-amazon.com/images/I/71zpUW2DcaL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: Active ingredient ?**
A: The active ingredient in Wet & Forget is Alkyl Dimethyl Benzyl Ammonium Chloride. I think this is the same ingredient that is in many kitchen surface cleaners. This chemical has other names too I believe like benylkonium chloride. Benzalkonium chloride, also known as BZK, BKC, BAC, alkyldimethylbenzylammonium chloride and ADBAC , is a type of cationic surfactant which has antiseptic and anti fungal properties.

**Q: Once moss is killed from between block pavers do you have to sweep up dead debris?**
A: Yes, I would definitely clean any debris away, if you are removing green alge, it just disapearers after a few days

**Q: Is it safe to use on  patio that cat walks across**
A: Yep my cat and dogs walk on the patio spray on a dry warm day it dries quickly and starts cleaning immediately

**Q: We have a bad infestation of lichen on a conservatory roof.    Has anyone had good results at removing same?**
A: we have had lots of moss on our patio and on the shed roof and over 6 months it has cleaned the lot but you have to do it when it is dry and then the sun and the rain clears it, it is great no scrubbing just spray it on and leave it

## Customer Reviews

### ⭐⭐⭐⭐⭐ Simply wet and forget!
*by R***L on 29 May 2026*

I used this in November 2024, yes that right and I am writing my review in May 2026. A whole 18 months later. Firstly those who thinks its cleaner like washing up liquid! Its not, you apply and leave it to work, you don't rinse it! Hence the name! Wet and Forget. On the container it even says results could take up to 6-12months. Do not expect results in hours, days or even weeks if they are stubborn! I spent a good 3 hours spraying it and noticed 3 months later that my back garden slab area looked less grimy, another 3 months and the front paving looked a little less grimy to now a whole 18 months later and the front paving is back to its original colours and you can clearly see the red/yellow/grey bricks. The back garden grey slabs looked bright and the crazy paving area no more moss. Like most I wasnt expecting a miracle but I am pleasantly surprised. If you havent the patience and want results fast then this is NOT the product you seek.

### ⭐⭐⭐⭐⭐ Works well but give it time!
*by C***G on 26 August 2025*

This is the second time I have purchased wet & forget and the results have been favourable in terms of eventually getting rid of algae, lichen and even moss for a period of time. I originally bought this to treat my block paving drive as I had what I'd described as white chewing gum stains and black spotty marks all over the area. I tried power washing and scrubbing with detergents but nothing seemed to work and then a friend advised to get wet & forget. I was a bit dubious it isn't a cheap option but I decided to give it a go and after 3-6 months I realised pretty much all the stains had gone! Now it certainly does not work overnight but I treated once and left (and genuinely fogot about it)... all the marks had gone, see attached pics of before and after treatment. Since then I have used my second container on my roof and even on a very old roof with high levels of moss growing. Here I did remove some of the moss with a plastic scrapper but the rest was down to spraying this product. It is so simple to do, just dilue 1 part wet & forget to 5 parts tap water, mix and then spray generously on the affected area. It is advisable to do this is dry conditions or when rain is not forecasted that day. Then wait, and over time you will see a difference. To conclude I am going to give this a full 5 stars it does actual work well. Only time will tell if it continues to work but in the case of my drive it remains clear of these marks after over a year+ period so I am genuinely happy with the results. It is not a cheap solution (there are lower cost alternatives which I have not used) but this one certainly delivers.

### ⭐⭐⭐⭐ Goes a fair amount but pricey
*by W***W on 16 February 2026*

Small amount for the price but dilutes down so not bad value. Does not smell chemical and the bottle was well packaged on arrival, easy to apply with a spray bottle and no leaks. Seemingly takes a while for removal but our green algae on the wooden fence slats went almost instantly. It looks really good now. Was worried about the effect on nearby grass but this seems less damaging than other chemicals we have used in the past. The slats now look much better. Really effective and hopefully long lasting. This should avoid us having paint the fence this year. I did most of our fence and also a decent amount of decking boards, spindles and siding with the smaller bottle. A big bottle would easily do a whole garden.

## Frequently Bought Together

- Wet & Forget Mould, Lichen & Algae Remover, Outdoor Cleaning Solution, Black Mould Remover, Bleach Free, 5 Litre
- Spear & Jackson 5LPAPS 5 Litre Pump Action Pressure Sprayer

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-08-19*