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We need something to clean concrete walls from all kinds of dirt. What do you think is the best way to do this? Can you recommend any good cleaning products?
I think that in order to clean something from concrete, you need to use products that contain caustic chemicals that eat away at the surface and thus clean it of all kinds of dirt.
In general, concrete walls have a very hard surface and to clean dirt from it, such as graffiti, you need to get special cleaning equipment that applies high water pressure. Only with its help you will be able to clean the concrete so well. And it is also desirable, of course, to buy an industrial concrete cleaner, which you can find here https://ipax.com/.