FILO Sodium Hypochlorite Patio Cleaner 4x5L – Brick Cleaner for Patios, Driveways & Outdoor Surfaces, Professional Strength Cleaning Solution for Routine Exterior Maintenance.

This is excellent stuff. Really does the job. Highly recommend it. Be careful, though, it's a very strong chemical.

Pretty well a commodity product without differentiation from similar products so price is important. Packaged well, containers sealed & sufficiently sturdy. Best choice for cleaning block paving, as opposed to jet washing which causes surface erosion after several washes. PPE absolute must; use in open spaces. If using a broom to spread the liquid, it's surprising how much actually flicks up and surprisingly high up so, as well as gloves and wellingtons wear waterproof over trousers & your least favourite top !! What worked for me: first soak the area with water to stop over absorption of the liquid, scatter the liquid over a small area (1-2 sq m), sweep to spread it across & into the surface, add a bit more water to ease the process, leave for up to 5 minutes before washing off.

Worked very well ease of application need to dress appropertly as its highly smelly but after a cold water wash off i'ts fine. appearence is very good .

Cleans well & quick. Used on patio, paving slabs & walk in shower.

I wish I had done a before and after photos It was hard to tell the true colour of the stone slabs other than black even after pressure washing. I mixed it 50/50 so still strong, it worked within minutes on most of the tiles leaving some stubborn black areas. I used neat bleach on these which appears to have worked. Very impressive.

Good. Works as it should.

The best product I have ever tried. Works great.

Brilliant for cleaning down pathways and stopping the weeds. Much stronger than the bleach that you get at the supermarket. So be very careful when you use it. Overall excellent.