Granite was blackened by fire, how can it be restored to its original state? Be in a hurry

there is a professional recovery method, which uses a dry ice sprayer to clean. The principle is that the block dry ice is put into the sprayer, and the sprayer sprays dry ice particles on the items to be cleaned. When the dry ice meets the objects at room temperature, it vaporizes immediately. The vaporization process is similar to a tiny local explosion, which can remove the dirt without leaving any traces. However, this kind of professional thing is usually used for cleaning valuables, such as ancient books.