If there is a residue of sharpening dust on the diamond and ceramic surfaces after a few sharpening movements, this can be removed with an eraser. For larger deposits, soak the surfaces in a hot water bath with dishwashing liquid. Then remove the residue with a brush. #horl1993 #sharpener #sharpknives #rollingknifesharpener #rollingsharpener #horlrollingsharpener #horlrollingknifesharpener #horlsharpener HORL® Online Shop: https://www.horl.com/ Follow us on Facebook: https://www.facebook.com/horl1993 Follow us on Instagram: https://www.instagram.com/horl1993/ Follow us on TikTok: https://www.tiktok.com/@horl.official FAQ's: https://www.horl.com/de_en/faq