Did you know that if you have a dirty oven it is less efficient and takes longer to cook? This in turn uses more electricity. The oven has to work harder to make up for the fact that the heat is absorbed by the sooty and greasy deposits rather than in the food.
Oven walls prefer to be clean and shiny as this allows heat to be reflected into the oven off the special coating. Food spills and greasy patches wonâ€™t add to the smoky flavour of your Sunday roast but will in fact create hazards such as bacteria that could get into your cooking.
Most greasy patches just sit there and burn as a hotspot sapping energy and adding to energy bills. To add to this spills cause smoke which ruin subtle flavours in some dishes. If you have small pets, the smoke generated from a dirty oven can also be harmful to them.
Greasy oven build up is also dangerous as it poses a fire risk if left to sit at the bottom of the oven. A quarter inch layer of fat and grease on an oven floor is similar to a small chip fan being cooked on full for 2 hours or so, which is a recipe for disaster if it catches alight.
An oven is a machine with moving parts and hot surfaces that need to cleaned to work effectively. The best maintenance you can give to an oven is to have it cleaned regularly for best performance, as a professional clean is better value than an oven that has been damaged by being dirty.