We recommend using ocular lens tissue for cleaning only if necessary. When not in use, keep the Posalux Diamond Tools covered using the rubber caps supplied. Always send your posalux diamond tools for us to carry out preventive maintenance (re-sharpening). Do not continue to use the device if clear lines are showing on the cut surface – The lines are caused by chipping of the diamond edge, and this means the diamond edge is blunt/dull. Prolonged usage of a direct/ flat diamond tool will increase chances of diamond breakage.