Avoid scratching the Watch Case against abrasive materials. To remove dust or dirt from the aluminium shell or interior, use a cloth dampened with clean water to gently clean. Any stubborn or sticky residue should be removed from the aluminium shell using a wipe pre-soaked in alcohol such as Isopropyl. Keep your Watch Case interior in good condition by avoiding prolonged contact with materials that may transfer coloured pigments onto the interior, protecting from humidity, and keeping out of direct sources of heat or sunlight as the interior's colour may wear.