The cleaning was carried out by wetting the surface with water and using a Long Q switched laser with a pulse duration of 120n, 130mJ energy and fluence between 0.5-1 J / cm2 to avoid the fusion phenomena that occur at higher fluences. In many cases the treated surface showed a yellowish hue immediately after the irradiation due to oxidative and redeposition dynamics: this phenomenon was clearly minimized when the irradiation was assisted by an Argon jet. In any case, it should be emphasized that this yellowing can be totally eliminated by using a finger, or a brush or a pad soaked in water or other solvent.