Very cautiously a soft toothbrush and water can first be tried to remove polish residues from the engraving without washing out the colour fill with it. If that brings no success or the colour is already largely washed out, going to a specialist dealer is advisable, who refills the engraving outpatient with special engraving paste or engraving pens. Aggressive cleaners are to be avoided, since they additionally remove the remaining colour and only leave a blind engraving. Professional refilling is the most reliable method to restore the original appearance.