Sodium Hypochlorite Patio Cleaner 4 x 5 litres of Industrial-Strength Algae & Black Spot Remover – Powerful Driveway & Paving Cleaner – Professional Outdoor Cleaning Solution for Concrete

This definitely worked on my patio ! Sprayed it all over and left to soak in then got the Karcher out and came up superb

I use this cleaner mainly for my block paving driveway that is prone to weeds and moss growing between the blocks. It is best diluted 1 part cleaner to 4 parts water, so I use a litre of the hypochlorite and 4 litres of hot water in a watering can and carefully cover the entire area to be treated. Be aware this is a strongly corrosive product so wear protective clothing to avoid splashing on your skin, especially hands and eyes. It acts as both a herbicide and cleaner. Your paving will be cleaner and clearer after use - normally a few days later. The great thing about sodium hypochlorite is it degrades to salt so should not harm the environment in the same way as some other chemicals. It also works really well on cement paving slabs, porous stone window sills and curbs. Also be aware when pouring it can splash a little when the container is quite full, so pour carefully or use a funnel. Overall this is a great product and most of the time beats harsh pressure washing.

I liked that it worked very quickly unlike less strong formulas that take days to show an effect. This is good when you only get a few days between rain showers. The downside is you really need to wear a pro quality respirator with appropriate cartridges as the stuff smells like ten swimming pools and is not a good thing to breath in. Goggles and gloves and old clothes essential. Full bio suit not an overreaction. But good when you've gone through the alternatives and still have an algae and moss issue on a large area.

Very strong and effective

Arrived a day early, which was great, looks like a good product. Will update at the weekend when I get to use it.

Ok. Historically I’ve pressure washed the patio. Last month, I spent a couple of hours AGAIN with the washer. Mildly better. I’ve used products that require scrubbing. Very time consuming and did do quite a good job. However I did not wish to spend half my life scrubbing! After a bit of research, and somewhat sceptical, I bought this product. Totally amazed! The photo shows a part application and the untreated area jet washed about a couple of weeks ago. It literally took about 20 minutes to apply to the area, plus about half that area again out of shot. The result was almost immediate. I left it about an hour, over which time I was gobsmacked! I just used a regular garden sprayer and diluted with 10% water. Thanks, great product.

Excellent Results easy to use Paths cleaned best eve

In the past We have spent hours pressure washing the patios in our garden using all sorts of different products and got poor results despite our efforts This product is amazing very little work NO PRESSURE WASHING and unbelievable results we are so pleased still have some remaining black spots but patios are all over 25 years old but they have really improved beyond expectations Would highly recommend this We used equal parts water to product and in some areas stronger but it is worth the cost we have purchase 3 x 4 but we have5 areas plus paths so pleased