How to Clean a Microwave: The Complete Guide
The most effective way to clean a microwave is the steam method: heat a bowl of water with lemon or vinegar for three to five minutes, leave the door closed for two minutes, then wipe clean. For a microwave that gets daily use, a quick wipe every few days and a proper deep clean once a week will keep it hygienic, odour-free, and performing at its best.
How often should you clean a microwave?
How often your microwave needs cleaning depends on how heavily it is used and what goes into it. A few splatters from reheating soup might not look serious, but left to dry and harden they become significantly more difficult to shift and will start to affect how the interior smells. The table below gives a practical schedule for most households.
Signs that your microwave needs attention sooner than scheduled: a persistent smell even when empty, visible food particles on the ceiling or walls, a greasy feel on the turntable, or uneven heating that suggests splattered food is absorbing microwave energyBurnt food residue can absorb microwave energy instead of your food, reducing heating efficiency and potentially causing hotspots or further burning. rather than your food doing so.
Safety before you start
A microwave is low-risk to clean compared to many kitchen appliances, but a few precautions are worth taking before you begin.
Never use steel wool, metal scourers, or anything abrasive on the interior. The coating on most microwave cavities is relatively soft and scratches easily. Once scratched, the surface becomes harder to clean and more prone to rusting over time. Equally, avoid spraying liquid directly into the appliance. Always apply cleaning solution to a cloth first, then wipe.
Quick clean: every few days
A quick clean takes under five minutes and is the single most effective habit for keeping your microwave in good condition. Done regularly, it means your weekly deep clean requires far less effort.
Dampen a soft cloth or sponge
Use warm water with a small amount of mild dish soap. The cloth should be damp, not wet enough to drip.
Wipe the interior surfaces
Work from the ceiling down to the walls and floor, paying attention to corners where grease collects. One pass is usually enough for fresh splatters.
Clean the door interior
Wipe the inside of the door and the door seal. The seal traps food particles and moisture which can cause odours if neglected.
Wipe the control panel carefully
Use a barely damp cloth on the control panel and handle. Excess moisture near buttons or displays can work into the electronics over time.
Check under the turntable
Even a small liquid spill under the turntable plate can generate bad smells once heated. Lift the plate and wipe underneath if there is any residue.
Deep clean methods
A deep clean tackles hardened grease, dried-on food, and embedded odours that a quick wipe cannot shift. There are two main approaches depending on the severity of the mess. Choose based on what you are dealing with.
The steam method is the best starting point for most deep cleans. Heat and moisture soften dried food so it wipes away without scrubbing, and the lemon or vinegar neutralises odours at the same time.
Prepare the bowl
Fill a microwave-safe bowl with approximately 250ml of water. Add several thick slices of lemon or two tablespoons of white vinegar. Lemon leaves a fresher scent; vinegar is more effective at cutting grease.
Heat until steaming
Place the bowl inside and heat on full power for three to five minutes. The water should reach a rolling boil and produce visible steam inside the cavity.
Leave the door closed
Do not open the door immediately. Leave it closed for a further two to three minutes so the steam continues to work on hardened residue.
Remove the bowl carefully
The bowl and water will be very hot. Use oven gloves or a tea towel and set it aside safely.
Wipe down all surfaces
Working from top to bottom, wipe the ceiling, walls, and floor with a clean damp cloth. Loosened residue should come away with minimal effort. Rinse the cloth and repeat if needed.
When steam alone is not enough for burnt-on food or stubborn grease patches, a baking soda paste provides gentle abrasion without damaging the interior coating.
Make a baking soda paste
Mix two tablespoons of baking soda with just enough water to form a thick paste. It should hold its shape without being runny.
Apply to the affected areas
Spread the paste directly onto burnt-on spots or stubborn grease patches. Leave it to sit for five minutes so the mild alkaline action can begin to break down the residue.
Scrub gently with a non-scratch sponge
Work in small circular motions. Baking soda is mildly abrasive enough to lift the residue without scratching the interior surface.
Wipe clean and rinse
Remove all paste residue with a clean damp cloth, rinsing the cloth thoroughly as you go. Leave the door open for a few minutes to air dry before use.
For particularly stubborn burnt-on deposits, try running the steam method first to soften the residue, then follow up with the baking soda paste. The combination is more effective than either method alone.
Cleaning the turntable and roller ring
The turntable plate and its roller ring sit at the base of the microwave and collect spills, grease, and food debris that the main wipe-down misses. They should be removed and cleaned separately as part of every deep clean.
Lift out both the glass turntable plate and the plastic roller ring beneath it. Wash them in warm soapy water using a soft sponge, or place the glass plate on the top rack of a dishwasher if the manufacturer confirms it is dishwasher-safe. Check your model’s manual if you are unsure — most glass plates are, but some have coatings that prefer hand washing.
Rinse both pieces thoroughly and allow them to dry completely before returning them to the microwave. Replacing a damp turntable creates a humid environment inside the appliance that encourages odours and can accelerate any corrosion of the cavity floor.
Getting rid of odours
A microwave can smell unpleasant even when it appears visually clean. Odour compounds from strong foods — fish, garlic, reheated curries — absorb into the interior surfaces over time. The steam method above will resolve most odours, but for persistent smells, these natural approaches work well.
Leaving an open bowl of dry baking soda inside overnight is one of the simplest and most effective deodorising methods. Baking soda is highly absorbent of airborne odour molecules and will significantly reduce lingering smells by the following morning. For particularly stubborn odours, a shallow dish of used coffee grounds works well, especially for fish or garlic smells that baking soda alone struggles with.
Going forward, the most effective prevention is covering food during heating. A microwave-safe splatter guardA vented plastic or silicone cover placed over food during heating. It contains splatter while allowing steam to escape, significantly reducing interior soiling. or a microwave-safe plate placed loosely over the dish catches splatter before it reaches the walls and ceiling. This single habit reduces cleaning frequency considerably.
Cleaning the exterior
The outside of a microwave is easy to overlook, but dust, grease, and fingerprints accumulate on the top, sides, and door front — particularly if the appliance sits near a hob or on a worktop where cooking vapour settles. A monthly wipe-down keeps it looking presentable and prevents grease from working into the vents.
Use a soft cloth with a mild all-purpose cleaner or diluted dish soap for most exterior surfaces. For stainless steel finishes, use a product formulated for stainless steel and wipe in the direction of the grain to avoid streaking. Always apply the cleaner to the cloth rather than spraying directly onto the appliance.
The vents on the sides or rear of the microwave allow heat to escape during operation. Keep them clear by occasionally running a soft brush or a vacuum attachment over them. Blocked vents cause the appliance to run hotter than intended and can shorten the life of the magnetron. If you have a built-in microwave in a housing unit, pay particular attention to whether the surrounding cabinetry allows adequate airflow around the vents.
What not to do
Do not use metal scourers or abrasive pads
Steel wool and heavy-duty scourers scratch the interior coating, making the surface harder to clean and more vulnerable to corrosion. Use non-scratch sponges only.
Do not spray cleaner directly inside the appliance
Liquid can work into the magnetron cavity, vents, or around the door switch contacts. Always apply cleaning solution to a cloth first, then wipe.
Do not use bleach
Bleach can damage interior surfaces, cause discolouration, and leave residual fumes that transfer to food. Mild dish soap, baking soda, or diluted white vinegar are all safer and more effective for this appliance.
Do not replace a wet turntable
Returning the turntable plate before it is fully dry traps moisture under it and on the cavity floor, encouraging unpleasant smells and accelerating surface corrosion.
Do not ignore the door seal
The rubber seal around the door traps food particles and moisture. A dirty seal can harbour bacteria and eventually affect the door’s ability to close correctly. Wipe it during every deep clean.
For more on maintaining kitchen appliances in good condition over the long term, the CATA Appliances Blog covers a range of care and maintenance guides across the full kitchen.
Frequently asked questions
The steam method. Place a microwave-safe bowl with 250ml of water and a few lemon slices or two tablespoons of white vinegar inside, heat on full power for three to five minutes, then leave the door closed for two minutes. The steam loosens dried food so it wipes away with minimal effort.
No. Bleach is not suitable for microwave interiors. It can damage the cavity coating, leave harmful residual fumes, and cause discolouration. Mild dish soap, baking soda paste, or diluted white vinegar are all effective and safe alternatives.
Start with the steam method using white vinegar, which neutralises odour compounds more effectively than lemon for burnt smells. After wiping clean, leave an open bowl of dry baking soda inside overnight. For very stubborn odours, a shallow dish of used coffee grounds can help. Repeat the steam treatment if the smell persists.
Yes, when diluted with water as described in the steam method. Diluted vinegar loosens grease, lifts dried food residue, and neutralises odours effectively. Avoid using undiluted vinegar directly on interior surfaces, as high concentrations can affect some finishes.
Most glass turntable plates are dishwasher-safe and can go on the top rack. Check your microwave’s manual to confirm, as some plates have coatings that are better suited to hand washing. The plastic roller ring beneath the plate should generally be hand washed in warm soapy water. Always allow both pieces to dry fully before replacing them.
Unplug the appliance first. Use a soft brush or vacuum with a brush attachment to remove dust and loose debris from the external vent grilles. If the vents are greasy, lightly dampen a cloth with warm soapy water and wipe carefully. Never direct liquid into the vents. Interior vents should only be cleaned by a qualified engineer.
Cover food during heating using a microwave-safe splatter guard, a vented microwave cover, or a microwave-safe plate placed loosely over the dish. Reduce power settings for foods that tend to spatter at high heat. Wipe the interior immediately after any visible splatter while it is still soft — this takes thirty seconds and avoids a much longer cleaning job later.
Summary
Keeping a microwave clean is largely a matter of consistency rather than effort. A quick wipe every few days prevents fresh splatters from hardening into stubborn deposits, and a steam clean once a week takes less than ten minutes while tackling grease, residue, and odours at the same time.
Use the steam method with lemon or vinegar for routine deep cleans, baking soda paste for anything that does not wipe away easily, and leave baking soda or coffee grounds inside overnight to deal with persistent smells. Avoid bleach, abrasive pads, and wet surfaces — and always cover food during heating to reduce how much cleaning is needed in the first place.
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