To ensure that your ghd duet style operates at the optimum efficiency, always ensure that the rear filter is kept clean. The product should be inspected before use, and the filter cleaned when visibly dirty, as per the instruction manual. Unplug from mains power supply and wait till cooled down. Wipe the outside of the ghd duet style with a damp cloth. Do not use sharp or abrasive detergents or corrosive products and never immerse the appliance in water. Finally, gently remove any dust and hair from the rear filter using a soft brush.