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

This was an absolute game changer for me. My patio was covered in black spot and was looking very tired. I tried this out got 10ltrs. Only need 5 ltrs to complete the clean. I did mix it strong and would advise a face mask as this is powerful stuff. I applied with a sprayer a slab at a time and you could see it start to fizz immediately. I coated the whole patio which is approx 25ft x 16ft and had a bit left in the spacer and I gave a little more to the more heavily stained ones. Within an hour you could see that the black spots were almost gone and it was looking like new. I did this in the evening so am gonna leave on till morning and the rinse with a hose. If you want a clean patio don’t think twice and get this. Also I have still got a 5 ltr tub full so I can dilute this weaker for a maintenance wash as apposed to a deep heavy clean. So win win for me. Very very happy.also no jetwasher was required

Absolutely brilliant product, I tried patio magic to get rid of very heavy black mould on the paving and wall which was useless, this cleared it completely after a couple of coats and some areas I used it neat but it certainly works.

Using a chlorine solution is known as "Soft Washing". Called this because high pressure blasting isn't necessary to get an amazing visual difference in a short time.Two areas of Indian sandstone patio were looking a mess, I thought that most in the more shaded area would need to be replaced! Sandstone is soft and porous by nature, algae and lichen love the stuff.Sandstone is vulnerable to erosion, using a Karcher dirt blaster lance started to cause pitting in some of the softest areas of individual slabs and I was looking for a better way to defeat algae, Lichen etc.I knew that after a general wash down, bleach was the tool, but the domestic thin bleach is just 2% w/v of sodium hypochlorite (Hypo), which didn't work, even applied neat and left to soak.This Hypo is 15% when new, I made a solution with 50% tap water, sprayed it on the slabs and quickly noticed areas of small bubbles as organic residues were oxidised. After sufficient dwell time, it was rinsed well with a hosepipe.There was an amazing initial effect and for a few hours after rinsing, the slabs appeared to be getting cleaner still!It didn't cause any chemical staining of the sandstone and hard scrubbing was not necessary.Some of the more heavily affected areas had a slight visible residue of dead organic stuff! This will lose its grip after a few rain showers, washes and a re-treatment.Value for money lost a point because I purchased two 5L containers, a single larger container would be cheaper by unit, but it was my first trial of this specific product.Ease of use lost some points, only to highlight that it isn't something anyone can apply safely. It MUST be used and handled with great care. PPE should be used, access to areas being treated must be controled, pets must be kept away until it has been rinsed very well. There's much more to safety than these basic points, which aren't a guide.I used a backpack sprayer with an oval "drift guard" surrounding the nozzle, this stopped spray mist from being blown away from where it was being applied.

This stuff works. Tried it neat and diluted 1:1 with water which worked equally well on very dirty Indian sandstone paving. Required rinsing but not the laborious jet washing of previous years. Use with caution, I wore full face mask and goggles and protect clothes, plants and pets. The powerful smell lasts or 2 or 3 days. Overall, very effective.

Very good great for mono block and getting dirt from rough cast spray on and leave and wash with water 15 minutes later great results

This works very well. I have a large driveway which for past few years I've given a quick whizz over with a patio attachment on my pressure washer. Unfortunately I think this just spreads the white lichen spores & black spot spores so they just come back over time, but much worse. After using this stuff, my driveway looks almost new. I did use the high pressure lance on my pressure washer, which of course forces out the sand between the block pavers. So I brushed in some 'Sika' setting sand. Took some time to do it properly, but worth the effort.

You Have be very careful when using this, wearing protective clothing.but on e it's applied it works wonders. We we had heard of this cleaner before now,..you will notice in the first picture the part by the house is a bit cleaner than the rest,we just used the jet washer on it on that part,then realised we needed something stronger which is when we ordered this cleaner

Work to very good Standard and very good cleaning products