16Care of catalytic linersCatalytic liners destroy splashes of food and fats whenthe oven temperature is raised to around 220°C.To aid this process it is a good idea to run the oven for anhour or two per week, without food, to ensure continuedgood performance from the Catalytic liners.Hints and Tips• Manual cleaning of the Catalytic liner is notrecommended. Damage will occur if soapimpregnated steel wool pads, aerosol cleaners andany other abrasives are used.• Slight discolouration and polishing of the Catalyticsurface may occur in time. This does not affect theCatalytic properties in any way.• Follow the recommendations given to keep ovensoilage to a minimum.Cooking to reduce soilageCook at the recommended temperatures. Highertemperatures during roasting will increase soilage. Trycooking at lower temperatures for an increased length oftime, you will save energy and often the joint is moretender.Use minimal, if any, extra oil or fat when roasting meat;potatoes only require brushing with fat before cooking.Extra fat in the oven during roasting will increasesplashing and soilage.It is NOT necessary to add water to the meat tin whenroasting. The water and the fat juices from the jointcreate excessive splattering during cooking, even atnormal temperatures, as well as causing condensation.Covering joints during cooking will also prevent splashingonto the interior surfaces; removing the covering for thelast 20-30 minutes will allow extra browning, if required.Some large joints and turkeys especially benefit fromthis method of cooking, allowing the joint to cook throughbefore the outside is overbrowned.Do use the roasting tin. During roasting, the fat from thejoint will be contained beneath the trivet and thereforeprevent it from splattering onto the 'Catalytic' liner.