A professional ultrasonic cleaning is offered by competent specialist retailers as well as specialised providers like scription.de. The polishing out of scratches and signs of use, on the other hand, is carried out neither by Montblanc nor by most specialist retailers, because the surface material is thereby weakened and wall thicknesses are reduced; with newer writing instruments, the warranty also lapses. Specialised restorers like Dr. Ink Thomas Watkinson polish older pieces case by case. Polishing oneself is possible with Wenol; in doing so, coated metal parts are sensitive, since gold platings are quickly worn off.