Sodium Hypochlorite Patio Cleaner – 2 x 5 Litres of Industrial-Strength Algae & Black Spot Remover – Powerful Driveway & Paving Cleaner – Professional Outdoor Cleaning Solution for Concrete

The Bottom Line: FIVE STARS. If your driveway, garden walls, or patio are blighted by deep-seated black spot lichen, stubborn green stains, or thick moss, this industrial-strength chemical is the absolute nuclear option. My provided 'Before and After' photos of my garden wall show the exact results you can expect. This isn't just a basic clean; it is a complete reset. It delivers jaw-dropping, professional-grade results without requiring hours of back-breaking scrubbing. • The Setup: After watching a professional contractor achieve incredible results on my driveway, I asked what he used. His secret weapon was industrial-strength Sodium Hypochlorite, so I immediately ordered this 2 x 5-Litre pack to tackle my weather-beaten garden walls. • The Process & Visual Proof: I applied the chemical completely neat (using a fine mist sprayer) to a heavily stained garden wall and left it to work its magic overnight. The Before image shows the extensive green algae, moss, and dark biological staining that had accumulated over years on a wall I have yet to clean. • The Results: After the neat application and a simple overnight wait, the change was dramatic. The After image shows a wall I have cleaned already. Every trace of thick, embedded moss, deep black spots, and persistent green stains vanished entirely. This after-photo captures the rich, clean, bright colour of the brickwork perfectly, making it look practically brand new. CRITICAL SAFETY WARNING: This product is incredibly potent. Treat it with respect. I strongly advise wearing heavy-duty gloves, protective hat, face mask, goggles, and old clothes. Avoid plants. Work backwards. I used this chemical with the Spear & Jackson Chemical Sprayer (reviewed separately).

Items delivered on time and very good and safe packed. I used to clean concrete slabs and tarmac. Both were neglected by the previous owner for 14 years. Full of black and white spots. I had to agitated with a very hard brush and after to rinse with pressure washer. Amazing result, everything looks brand new. I will recommend this company

Cleaned the patio well. Some stains it couldn’t get rid of though so may have to redo some areas. But on the whole it got rid of the winter stuff and the tiles look a lot better

i have 250 flagstones at the rear of my house, normally i jet wash them twice a year, takes about 3hrs to do them. just used this product, 10x1. water.1solution, filled my watering can twice to cover the whole rear. left for 30min hosed down,all came like new, 10 litres water. 1 litre solution. no more jet washing.sk

I love this stuff! It might be a relatively lazy way to clean the patio but it works, and it works fast. It makes everything smell like a swimming pool initially. It will take two applications to get the patio fully clean. I recommend the Spear and Jackson sprayer to go with this.

This is a superb patio cleaner, does exactly what it says on the tin. Easy to use, mix it up, spread with a watering can, leave 20-30 mins, and then just hose off. My patio looks like new.

Great product ,easy to use.very satisfied and super service from amazon

Gets rid of moss and mould. Did the job.