40• Overheated fats and oils catch fire quickly. You should supervisecooking when preparing foods in fat or oil (e.g. chips).• Switch off the cooking zones after use.Safety When Cleaning• For safety reasons do not clean the appliance with a steam jet or highpressure cleaner.• Clean the hob in accordance with the maintenance and cleaning in-structions in this manual.To Avoid Damaging Your Appliance• Do not use the hob as a work surface or for storage.• Do not operate the cooking zones when there is no pan or the pansare empty.• Ceramic glass is insensitve to temperature shock and very robust;however it is not unbreakable. Especially sharp and hard objects thatfall on the cooking surface can damage it.• Do not use cast iron pans or pans with a rough, burred or damagedbase. Scratching may occur if the pans are slid across the surface.• Do not place any pans on the hob frame. Scratching and damage tothe paint may occur.• Make sure that no acidic liquids, e.g. vinegar, lemon or descalingagents, are spilt onto the hob frame, since these cause dull spots.• If sugar or a preparation with sugar comes into contact with the hotcooking zone and melts there it must be cleaned off immediatelywith a scraper while it is still hot. If it cools, the surface may be dam-aged when it is removed.• Keep all items and materials that can melt away from the ceramicglass surface, e.g. plastics, aluminium foil, or oven foils. If somethingof this nature should melt onto the ceramic glass surface, it must alsobe removed immediately using the scraper.