How to clean an oven, and when to use the self-clean cycle

An oven gets dirty slowly and then all at once. Grease spatters onto the floor of the cavity, sugar and cheese caramelise on the walls, and a spill that is never cleaned bakes into a hard crust that is difficult to shift. Two methods clean an oven well. One is a gentle manual clean that you can do every few months. The other is the self-clean cycle, which heats the oven to a very high temperature and burns off the soil. Each has its place, and the one that is safe for your oven depends on the manual and on how dirty it has become.

Read the manual first

Look at the manual before you clean. It will tell you whether your oven has a self-clean cycle, how long it runs, which parts must come out before it starts, and whether the interior has a coating that should never see chemical cleaner. Some ovens also have a steam-clean setting for light soil, which is a useful middle option. If you have lost the manual, the maker’s website usually has a copy, and the model number is printed on the door frame or inside the door.

Before you run the self-clean cycle

The self-clean cycle heats the oven to a very high temperature, often around 800 to 900 degrees Fahrenheit, for a few hours. That heat is what burns off the soil, and it is also why you must prepare the oven properly.

1. Take out the racks, the baking sheets and any probe or thermometer. Most manuals say the racks should come out, because the metal discolours at that heat and some finishes can warp. Clean the racks by hand later, as described below.
2. Wipe up any loose food, crumbs and large spills while the oven is cool. A heavy layer of grease burns off with a lot of smoke, which can set off smoke alarms and make the kitchen smell strongly for a day. Removing the big pieces by hand cuts the smoke down a lot.
3. Remove any aluminum foil lining from the floor or the racks. The manual will say so, because foil can melt or damage the heating element and the floor of the oven.
4. Move pet birds out of the kitchen. The high heat can give off fumes that are harmful to birds, so take them to another room, or to a different part of the house, for the whole cycle and until the kitchen has aired out.
5. Open a window and run the exhaust fan, or both. Smoke and fumes come out of the door vent during the cycle, so clear airflow helps a lot.
6. Keep children and pets out of the kitchen while the cycle runs. The door locks during the cycle and stays hot for a long time afterwards.

Start the cycle as the manual describes, and do not leave the house while it runs. Some smoke and a burnt smell are normal, especially on the first run. If you see flames inside the oven, turn it off and wait for it to cool before you do anything else.

After the self-clean cycle

When the cycle finishes, the oven will be locked until it cools, which can take an hour or more. Do not try to open it early.

Once it is cool, the interior will be covered in a fine gray or white ash. Wipe it out with a damp cloth or a soft sponge. Some residue may remain in corners and around the door seal. Use a damp cloth and a little dish soap for those, then dry the interior. Do not use a metal scraper or a steel pad on the walls, which can scratch the coating.

Replace the racks once they are cool. Wash them by hand in warm soapy water, using a non-scratch pad. If the racks are very stained, soak them in the sink with hot water and dish soap for an hour, then scrub gently. Dry them completely before you put them back, so water does not drip onto the hot enamel.

The manual clean for light and regular soil

For regular cleaning, a gentle method is enough, and it avoids the self-clean cycle altogether. It suits an oven that is cleaned every few months, and it is the safest choice for an oven with a delicate interior.

1. Remove the racks and wash them in the sink as described above.
2. Make a paste from baking soda and a small amount of water. Spread it over the greasy areas of the interior with a damp cloth or a soft brush. Avoid the heating element and the fan cover.
3. Leave the paste on for at least 15 minutes, and up to overnight for heavy soil.
4. Wipe the paste away with a damp cloth, rinsing the cloth often. Go over the walls and the floor until the surface feels clear and smooth.
5. Clean the glass door on both sides with a little dish soap and warm water, or with white vinegar diluted with water. Dry it with a clean cloth.
6. Wipe the outside of the oven, the control panel and the knobs with a damp cloth, lightly. Keep moisture away from the controls.

Chemical oven cleaners

Chemical oven cleaners are strong alkaline products, and they can be effective on old, heavy grease. They also need care. Read the label, wear gloves and eye protection, open a window, and keep the product away from children and pets. Spray only the areas the label allows, and never on the heating element, the fan, the temperature sensor or the door seal.

Most self-cleaning ovens should not be treated with a chemical cleaner, and the manual will say so. If your oven does allow it, follow the label exactly, leave the cleaner for the stated time, and wipe off every trace of it with a damp cloth. Rinse the cloth often, and wipe again until no residue is left, because leftover cleaner can smoke and smell at the next use.

Never mix an oven cleaner with bleach, vinegar or any other cleaner. Mixing two cleaning products can release gases that are hazardous to breathe.

Cleaning the glass door

The inside of the glass door traps grease and heat stains, and it is easy to neglect. Remove the door if the manual says it can be removed for cleaning, which gives you access to both sides of the glass. Clean with warm soapy water and a soft cloth, or with a glass cleaner, and use a plastic scraper for stuck-on spatters. Avoid abrasive pads on coated glass, which can scratch the coating and cause the glass to look cloudy.

What to avoid

Do not line the bottom of the oven with aluminum foil, because it can damage the heating element and it may stop the heat from circulating properly. Do not use steel wool on enamel or on coated glass, and do not let water sit in the bottom of a hot oven, which can crack the enamel. Keep the racks in the oven during normal cooking, not during the self-clean cycle, unless the manual says they can stay.

How often to clean

Wipe spills as soon as the oven is cool enough to touch. For a regular oven, do a manual clean every two or three months, or every month if you bake or roast often. Run the self-clean cycle no more than the manual suggests, which is usually once or twice a year for most households. Frequent self-cleaning can wear the seals and the coating faster than normal use does.

If the oven smells of gas, if the flame pattern on a gas oven looks wrong, or if the self-clean cycle does not start or does not finish, stop using the oven and call a qualified repair technician. A gas smell is a safety problem, and it needs a professional, not a cleaning product.