I applied Patio Magic yesterday, temp around 10C and dry. Sprayed it on and as suggest above, therefore easy to see where one has covered.
What am expecting to see because 24 hrs later? Seems that all the paving stone are still discoloured. They did not have green slimy algae, just looking browny and dirty with much darker spots all over; the pressure washer would not really remove the 'dirty' which is why I hoped that PM would.
First photo is in front of the entry door where the slabs have never really become stained. however, the darker area has developed and I had hoped the PM would remove it. Seems not to be the case.
Second photo is typical slabs in front of the garage. Lots of black(ish) marks and just dirty, that the pressure washer will not budge. Not slimy. The cleaner slab on the left side is in desperation, I tried some weak bleach, which has improved the look more the PM but has not done anything to the black blobs.
Two weeks; thought we lived in the high-speed digital world. I have no choice so will leave it. My house is white rendered and although the render does not go to the ground, rain splash-back does cause a bit of green algae to grow. Nothing too bad and I usually just bush it off. I did give a squirt with PM and today, it is all gone. Just wonder if there is a difference between green algae and the black and staining on the slabs.
Like you I was doubtful that it would work when I first used it and nothing happened after a few days. Then I noticed patches of orange appearing on the slabs as it got to work. After a couple of weeks there was a big difference.
It works slowly and gently. I used to use a pressure washer, but that damaged the surface of the slabs. I've found PM does the job just as well without damage it also keeps the slabs clean for about 6 months.
Billericay - Essex
Knowledge is knowing that a tomato is a fruit. Wisdom is not putting it in a fruit salad.
Bit like using moss killer or similar; it takes time before there is a noticeable difference. As whatever is causing the discolouration is likely to be some kind of biological 'growth' in/on the slab, it will take time to work. And now it has been applied, I cannot unapply, so time will tell.
My slabs are just regular paving, nothing special. The pressure washer does not do noticeable damage but trying to clean a 98sq.m area with pressure area about the size of a pencil is a waste of time.
trying to clean a 98sq.m area with pressure area about the size of a pencil is a waste of time.
Yes - I know what you mean 🤣 My area is far smaller, but as you say using a jet washer takes ages and uses a lot of water in the process. Let us know how it looks in a couple of weeks
Billericay - Essex
Knowledge is knowing that a tomato is a fruit. Wisdom is not putting it in a fruit salad.
I found that the only thing that worked on the black spots on our sandstone paving was Patio Black Spot Remover (available on line and at big flower shows). It costs an arm and a leg, admittedly, but when I had sprayed it on, the paving looked absolutely as new, to our amazement, and you can get a slightly less expensive product to apply annually to keep it that way. It is also advertised as a completely natural product and does not seem to damage plants.
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Just give it some time.
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
Like you I was doubtful that it would work when I first used it and nothing happened after a few days.
Then I noticed patches of orange appearing on the slabs as it got to work.
After a couple of weeks there was a big difference.
It works slowly and gently.
I used to use a pressure washer, but that damaged the surface of the slabs.
I've found PM does the job just as well without damage it also keeps the slabs clean for about 6 months.
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
My area is far smaller, but as you say using a jet washer takes ages and uses a lot of water in the process.
Let us know how it looks in a couple of weeks
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.