Many are based on caustic soda (sodium hydroxide), which is extremely poisonous and corrosive. Non-caustic cream cleaners contain other harmful chemicals, such as strong alkalis, which can cause skin complaints.
Alternative
If you haven't got an oven with a self-cleaning lining, roast meat at lower temperatures which won't make the fat splash or spit. Cover the food with a lid or foil. Wipe the oven while it is still warm with a damp cloth to prevent a build-up of grease. If it gets dirty, sprinkle bicarbonate of soda around the oven while it is still warm. Leave for an hour, then wipe clean.
