I'd buy a dozen if they were capable of permanently removing graffiti "ARTISTS" from the surface of the earth.
Having seen the sheer volume, a lot of very skilled graphic artists going to waste, in Italy along the railway system on concrete retaining walls etc I agree it's never going to clean it all up, for cleaning up ancient stone work however it's probably a lot less damaging than chemicals and high pressure water cleaning methods.
I just searched for laser RUST removal on this site, which I ve seen elsewhere. That’s interesting. This graffiti removing instrument is only of use for conservation of historic buildings, but I wonder whether the much faster rust removing laser could be used for cleaning up elsewhere?
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