Custom Chemical Supplies Sodium Hypochlorite 14-15% 4x5L, Patio Cleaner | High Strength, Swimming Pool Chlorine, Pale yellow (SH1415-20)

Here's what worked for me. I removed the mud from my blick driveway pointing, then used a jet washer to blast the bricks clean. The black spots refused to budge.Much to my surprise - you have to be sceptical right - this cleaner worked like a dream! I simply used a watering can & a 50 / 50 water mix, and sprayed away!The black spots either disappeared or evolved into grey marks, which another jet wash removed easily.Highly recommended, both for its effectiveness and for ease of applying.

I liked it as worked as advertised And killed the weeds. No jet washing from now on.

I have used this a few times with a powerful petrol pressure washer, it works as well as anything else I have tried. It is always difficult to shift black mould spots with any cleaning fluid. PPE is essential when using this as it is a strong chemical.

Great product for cleaning algae, killing moss and paving slabs. No longer need a pressure washer after using this product. Excellent and will keep buying.

Patio looks nice and clean with no effort

Worked well when applied to black spot mold on a driveway neat.

Great stuff for cleaning patio use neat for best results

Very easy to use with very little effort.