*These glasses have the peculiarity of rigidity and longevity. Moreover they are stain-resistant, scratch-resistant, anti-mould, waterproof, resistant to chemicals, to solvents and to tears.

If there are abrasions due to metalic objects of different kinds on the ceramic effect glass, it is sufficient to wipe with a wet sponge till the removal of the scratch; 
Use the soft part of the sponge for delicate abrasions and the rough part for persistants abrasions.

Only superficial abrasions could be treated. Those deeper due to a wrong use of the surface couldn't be treated.