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

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.

Excellent product, good value and made a huge difference to finish on the patio and oaths.

used to clean pathways, did the job fine.

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

Fantastic stuff! I have a 1970s property that’s probably never seen a clean roof since the day it was installed. After biting the bullet to have scaffold erected I saw the opportunity to do so myself. I bought 4 bottles. I used roughly 2 bottles per side (see images for size of roof - roughly 8m long). Day 1; About 2pm I sprayed on neat using a cheap pump spray from a reputable trade store for about £9. Left overnight. Day 2; everything that was living no longer was.... Unfortunately I never took a before photo but trust me it’s like day and night. I just thought I would post this because so many say not to use it neat and there’s no harm in doing so just make sure you MUST use goggles and some form of respirator (there’s no cure for chemical inhalation and this is the equivalent of bleach!!!)... Oh and wear plastic bags inside your socks if there’s any chance of your sock soaking it up like mine 😬 trust me it stings the skin for a little while depending on exposure! I washed mine as soon as I felt the burning sensation and no long term damage. Don’t be deterred by DELIVERY as I ordered Friday and it arrived Monday when it was estimated from Monday week! Fantastic product and fantastic service. Just to clarify I pressure washed it on day 2 once it was all dead. The dead looking side (on the left) is after use of product on day 2 prior to jet washing. If your going to jet wash only do it aiming down from the ridge (hence the scaffolding) not up at the ridge as water ingress is highly likely. Hope this helps someone on the fence!

Check out my before and after photos! That's all I need to say. I had a particularly bad case of black spot and it took several applications, but I got there in the end.

My Indian stone was black and slippy. Looked awful. Power washer didn’t really make it sparkle. But this stuff is amazing !! Use a spray very near the ground on a very still day. Rinse it well. Leggings ruined but worth it. Lasts longer too. Minimal effort with best results. Wash out the power spray though or it won’t last until next time.