---
product_id: 55170631
title: "Patio Cleaner Xtreme - 5L - Powerful Black Spot Remover Patio Cleaner & Rapid Mould Lichen and Algae Remover for Cleaning Stone Paving, Concrete, Sandstone, Porcelain, Slate & Granite"
brand: "smartseal"
price: "€ 174.65"
currency: EUR
in_stock: true
reviews_count: 8
category: "Smart Seal"
url: https://www.desertcart.fi/products/55170631-patio-cleaner-xtreme-5l-powerful-black-spot-remover-patio-cleaner
store_origin: FI
region: Finland
---

# 4 powerful active ingredients 5L covers ~40m² fast-acting formula Patio Cleaner Xtreme - 5L - Powerful Black Spot Remover Patio Cleaner & Rapid Mould Lichen and Algae Remover for Cleaning Stone Paving, Concrete, Sandstone, Porcelain, Slate & Granite

**Brand:** smartseal
**Price:** € 174.65
**Availability:** ✅ In Stock

## Summary

> ✨ Transform your patio from grimy to gleaming—don’t let black spots cramp your outdoor style! 🏡

## Quick Answers

- **What is this?** Patio Cleaner Xtreme - 5L - Powerful Black Spot Remover Patio Cleaner & Rapid Mould Lichen and Algae Remover for Cleaning Stone Paving, Concrete, Sandstone, Porcelain, Slate & Granite by smartseal
- **How much does it cost?** € 174.65 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/55170631-patio-cleaner-xtreme-5l-powerful-black-spot-remover-patio-cleaner)

## Best For

- smartseal enthusiasts

## Why This Product

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

## Key Features

- • **Rapid Results:** Swiftly erases stubborn black spots so you spend less time cleaning ⏱️
- • **Trusted & Proven:** Thousands of rave reviews confirm it’s the ultimate black spot remover you can rely on ⭐
- • **Powerhouse Formula:** Four potent actives stop algae, lichens & fungi dead in their tracks ⚡
- • **Concentrated Efficiency:** 5 litres treats up to 40m², delivering professional-grade results without the hassle 🧴
- • **Versatile Surface Savior:** Perfect for concrete, sandstone, stone patios & pavements—one cleaner to rule them all 🧱

## Overview

SmartSeal Patio Cleaner Xtreme is a highly concentrated 5-litre patio cleaning fluid formulated with four powerful active ingredients to eradicate stubborn black lichen, algae, and fungal growth on various hard surfaces. Designed for fast, efficient cleaning, it covers approximately 40m² per bottle and is trusted by thousands for restoring patios, paving slabs, and natural stone to pristine condition without harsh chemicals like sodium hypochlorite.

## Description

From the brand How Smartseal Began Founded in 2007 by Nigel Blake, with over 15 years of experience, Smartseal began with a simple idea: make professional sealing products & knowledge accessible to all. What's Different About Smartseal For 15+ years, we’ve supplied high-quality cleaning, sealing, and coating products for all hard surfaces, combining technical expertise with innovation to stay at the cutting edge. Why Choose Smartseal With thousands of positive reviews, we offer premium products plus guides, how-to videos, and expert advice to help you restore, protect, and enhance your property with confidence. How Smartseal Began Founded in 2007 by Nigel Blake, with over 15 years of experience, Smartseal began with a simple idea: make professional sealing products & knowledge accessible to all. What's Different About Smartseal For 15+ years, we’ve supplied high-quality cleaning, sealing, and coating products for all hard surfaces, combining technical expertise with innovation to stay at the cutting edge. Why Choose Smartseal With thousands of positive reviews, we offer premium products plus guides, how-to videos, and expert advice to help you restore, protect, and enhance your property with confidence. We Offer Cleaners Visit the store We Offer Cleaners Visit the store We Offer Sealers Visit the store We Offer Sealers We Offer Paints & Coatings Visit the store We Offer Paints & Coatings

Review: This stuff is fantastic! - I seldom leave reviews but felt compelled to write this one. I had a new garden path laid three years ago, at some considerable cost. It is a pale Indian sandstone. We started developing immediate black spot problems and three years later, you could not see some of the stones for the black, they were completely covered. Power washing didn't touch it, and the path looked terrible, with a cloudy finish and masses of black spot all over it. This morning I received this product, put the protective gear on, and thought I will spray neat on the really bad bits and then do a 1:1 dilution and do the rest, as I was worried I wouldn't have enough. As I started to spray the neat product, I did about five stones, and then turned back, and good god, genuinely, the black spot had gone, literally gone. I've now done the rest of the path, with a mix of neat and diluted, and it's like new. This is one of the few products I've ever bought which actually does exactly what it says it does. I will be buying more and using it when required if it comes back. If your patio or path has black spot, honestly don't hesitate, this stuff is brilliant. Totally and utterly worth it. Update, bought again this year, due to the mild winter I had really bad black spot again, I power wash first and use this simply for thr black spot. Put it on in a 50/50 dilution, and the black spots just disappeared , bringing it up like new. It’s like a magic eraser. Brilliant product.
Review: Saved me thousands from replacement of old path and patio - Have ordered this stuff twice recently and can say it has saved my patio and front path. Alot better than expected. Used it a few times on front path with a pressure washer set on highest pressure setting and has Brought it back to nearly new. Anyone who buys this your path/patio may new cleaning a few times but be persistent and this does the job. Will be ordering for 3rd time very soon to do my path in the garden. Saved ££££'s in replacing old path and patio. Highly recommend 👍

## Features

- YOUR ULTIMATE CLEANING SOLUTION - Our patio cleaner, part of the Xtreme range from SmartSeal, contains four powerful active ingredients that effectively inhibit further growth and spread of lichens, algae & any other fungal growths that are often seen on patios. A unique blend of cleaning surfactants, formulated as a more effective alternative to Sodium Hypochlorite.
- HIGHLY EFFECTIVE IN REMOVING STUBBORN BLACK LICHEN OR PATIO BLACK SPOT - Experience the power of Smartseal Green Clear, the ultimate patio cleaner specifically formulated to tackle stubborn black lichen, more often referred to as patio Black Spot. Say goodbye to persistent black spots caused by damp conditions as this heavy-duty patio cleaner targets and eliminates them with precision.
- ULTIMATE PATIO BLACK SPOT REMOVER & NATURAL STONE CLEANER - Eliminate algae growth and maintain a pristine looking patio with our trusted formula. Experience hassle-free patio maintenance with our Ultimate Patio Black Spot Remover & Natural Stone Cleaner, trusted and tested on all algae types, including green, white, yellow and black lichen, ensuring your outdoor spaces remain spotless and beautiful.
- SWIFT AND EFFICIENT CLEANING - With its fast-acting formula, SmartSeal Patio Clean Xtreme, the ultimate black spot patio cleaner and patio black spot remover for natural stone, ensures a swift and efficient patio cleaning process. Spend less time scrubbing and more time enjoying your outdoor space. Witness the transformation as it quickly removes dirt, grime, moss, and other stubborn stains. Say goodbye to unsightly black spots on your patio and pathways with our powerful patio cleaners!
- VERSATILE USAGE - Our patio cleaner has been specifically designed to be suitable for various surfaces. Whether you need a concrete cleaner, Indian sandstone cleaner, stone patio cleaner, pavement cleaner, Indian stone cleaner, or stone cleaner, our product delivers fantastic results. With its powerful formula, it tackles dirt and grime. Leaving the surface of your patio looking fresh and revitalised! 5 Litres will clean approximately 40m2.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01BTVNDHK |
| Customer Reviews | 4.4 4.4 out of 5 stars (1,946) |
| Date First Available | 16 Feb. 2016 |
| Item volume | 5 Litres |
| Manufacturer | Smartseal UK Ltd |
| Manufacturer reference | sm-patioex-5 |
| Part number | sm-patioex-5 |

## Product Details

- **Brand:** SmartSeal
- **Item form:** Liquid
- **Liquid volume:** 5 Litres
- **Manufacturer:** Smartseal UK Ltd
- **Unit count:** 5000.0 millilitre(s)

## Images

![Patio Cleaner Xtreme - 5L - Powerful Black Spot Remover Patio Cleaner & Rapid Mould Lichen and Algae Remover for Cleaning Stone Paving, Concrete, Sandstone, Porcelain, Slate & Granite - Image 1](https://m.media-amazon.com/images/I/81gKXGt+2NL.jpg)

## Questions & Answers

**Q: What area does it cover**
A: 40 square meters when diluted 1:1. Using a sprayer rather than a watering can possibly make the solution cover a wider area.

**Q: I’ve just had a new patio laid but it’s covered on resin grout. Will this remove the grout**
A: It will not remove ‘resin’ from where  a ‘sweep in’ pointing compound has been used The product is formulated to remove ‘ organic’ growth and dirt. It will not damage the actual pointing material itself. Hope that helps!

**Q: Will this remove ink stains from a limestone patio?**
A: We cannot promise it will. Depends on how far the ink has soaked into the Limestone. Regards George@Smartseal

**Q: Can I use this instead of a pressure washer on roof terrace tiles made of cement (currently a bit green and generally covered in London grime?**
A: I sprayed the solution on the outside concrete patio tiles first. Then power washed the concrete off afterwards. This removed the black spot. Good luck.

## Customer Reviews

### ⭐⭐⭐⭐⭐ This stuff is fantastic!
*by L***B on 26 April 2019*

I seldom leave reviews but felt compelled to write this one. I had a new garden path laid three years ago, at some considerable cost. It is a pale Indian sandstone. We started developing immediate black spot problems and three years later, you could not see some of the stones for the black, they were completely covered. Power washing didn't touch it, and the path looked terrible, with a cloudy finish and masses of black spot all over it. This morning I received this product, put the protective gear on, and thought I will spray neat on the really bad bits and then do a 1:1 dilution and do the rest, as I was worried I wouldn't have enough. As I started to spray the neat product, I did about five stones, and then turned back, and good god, genuinely, the black spot had gone, literally gone. I've now done the rest of the path, with a mix of neat and diluted, and it's like new. This is one of the few products I've ever bought which actually does exactly what it says it does. I will be buying more and using it when required if it comes back. If your patio or path has black spot, honestly don't hesitate, this stuff is brilliant. Totally and utterly worth it. Update, bought again this year, due to the mild winter I had really bad black spot again, I power wash first and use this simply for thr black spot. Put it on in a 50/50 dilution, and the black spots just disappeared , bringing it up like new. It’s like a magic eraser. Brilliant product.

### ⭐⭐⭐⭐⭐ Saved me thousands from replacement of old path and patio
*by T***S on 20 June 2025*

Have ordered this stuff twice recently and can say it has saved my patio and front path. Alot better than expected. Used it a few times on front path with a pressure washer set on highest pressure setting and has Brought it back to nearly new. Anyone who buys this your path/patio may new cleaning a few times but be persistent and this does the job. Will be ordering for 3rd time very soon to do my path in the garden. Saved ££££'s in replacing old path and patio. Highly recommend 👍

### ⭐⭐⭐⭐ Works well
*by M***D on 8 December 2025*

Works well. Expensive and I needed more than I thought I would, but it definitely worked well.

## Frequently Bought Together

- SmartSeal Patio Cleaner Xtreme - Powerful Easy To Apply Patio Cleaner Fluid - Highly Concentrated Patio Black Spot Remover and Paving Slab Cleaner - Eradicate Stubborn Patio Black Spots (5 Litres)
- Spear & Jackson 5LPAPS 5 Litre Pump Action Pressure Sprayer
- Mitclear Heavy Duty Wire Broom with Telescopic Handle(57IN), Stiff Metal Bristle Brush for Removing Weed Moss Algae, Outdoor Floor Scrub Brush for Patio, Deck, Garden

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-02-28*