Concrete stains on monoblock

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United Kingdom
I have, what I believe to be concrete 'stains' on my monoblock.

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I tried to scrub away the stain with cold water and then hot, this was the result:
20200404_092603.jpg


Anyone help?
 
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What pressure would I need?

Checked an amazon, there are a wide range of these devices available at varying prices.
 
Try and borrow one from a neighbour first. Or work out your budget and go for a Karcher model.

Andy
 
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It will weather away. Have another look in a year or so.
 
It's probably mineral salts that dissolved in water, rising to the surface and left behind as the water evaporates off.

trying to clean off with water is fairly unsuccessul. if the salts redissolve, they soak back in. The extra water, when it dries out, evaporates off the surface and leaves more salts behind.

It is similar to limescale. Sand and cement both contain a variety of minerals.
 

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