Techniques in general used by the firms of cleaning corrupt support tremendously: stone, brick...
Bad stone treatment :
Our technique (cleaning by nébulisation) respects all the support in any point, because it is neither a mechanical action, nor a chemical action - extinguisher the difference of cleanings by gritting, hydrorubbing-out, washing high - pressure...
Spray refacing (Le Louvre - Paris) :
Church Saint Vincent (Metz) :