Burnt-on grease is one of the hardest oven cleaning problems to tackle because repeated cooking turns ordinary spills into thick, carbonised deposits. For light build-up, steam, bicarbonate of soda or a suitable oven cleaner may help. When grease has accumulated for months or years, professional oven cleaning can be faster and more effective.
Why Does Oven Grease Become So Difficult to Remove?
Fresh cooking spills are relatively easy to wipe away. The problem begins when grease and food residue are repeatedly exposed to high temperatures.
Over time, the residue becomes baked onto the oven’s internal surfaces. Eventually, a simple wipe or household kitchen spray will no longer be enough.
This is why a neglected oven can take hours to clean properly.
Recent UK cleaning guidance continues to highlight burnt-on grease and baked-on food as some of the most difficult oven cleaning problems. Which? testing in 2026 also compared commercial oven cleaners and homemade methods specifically for this type of heavy build-up.
How to Remove Burnt-On Grease from an Oven at Home
If the grease is not extremely old or thick, you can try cleaning it yourself.
Before starting, switch the oven off and allow it to cool completely. Remove loose food debris and take out the racks.
1. Soften the grease first
One of the easiest ways to make stubborn grease more manageable is to soften it before scrubbing.
Steam can help loosen baked-on residue. A simple method is to place a heat-resistant dish containing water in the oven and warm it, allowing the steam to work on the grease before switching the oven off and letting it cool.
Lemon can also be added to the water for a fresh smell and some additional degreasing action.
2. Try a bicarbonate of soda paste
For less severe grease, bicarbonate of soda mixed with water can create a mild cleaning paste.
Apply it to heavily soiled areas and leave it for several hours before wiping it away.
This can be useful for ordinary baked-on food and grease, but it is not a miracle solution for years of carbonised deposits.
More importantly, avoid assuming that bicarbonate of soda is safe for every part of the oven.
Do not use abrasive products or scourers on oven glass, as they can create small scratches.
What About Strong Oven Cleaners?
Commercial oven cleaners can be much more effective against stubborn grease than ordinary kitchen sprays.
However, they also require considerably more care.
Some oven cleaners contain powerful chemicals that can irritate or damage skin and eyes. Product instructions need to be followed carefully, including requirements for gloves, ventilation and surfaces on which the product can be used.
Different ovens can also have different materials and coatings.
Before using a strong cleaner, check:
- Whether it is suitable for your oven
- Whether it can be used on the door glass
- Whether it is suitable for aluminium
- Whether it can contact heating elements
- Whether the oven has a catalytic or self-cleaning coating
- Whether the manufacturer gives specific cleaning instructions
A product that works brilliantly on one oven can damage another if used incorrectly.
Why Scrubbing Harder Is Not Always the Answer
When grease refuses to move, the natural reaction is often to use more pressure.
Unfortunately, aggressive scrubbing can damage surfaces without necessarily removing the underlying problem.
This is particularly important around:
- Oven glass
- Door seals
- Painted or coated surfaces
- Aluminium components
- Heating elements
- Fan areas
The aim should be to soften and remove the grease, rather than simply attacking it with increasingly abrasive tools.
For extremely dirty ovens, repeated DIY attempts can also take significantly longer than expected.
How to Clean an Oven That Has Not Been Cleaned for Months
If an oven has accumulated grease for months, the process becomes considerably more involved.
You may need to work through the oven in stages:
- Remove loose debris.
- Take out the racks and accessories.
- Soften the grease.
- Apply a suitable degreasing treatment.
- Allow sufficient contact time.
- Carefully remove loosened residue.
- Wipe away remaining cleaning product.
- Repeat treatment where necessary.
- Clean the door and glass using a suitable method.
- Dry and inspect the oven before using it again.
For a heavily neglected oven, this can easily turn into a long and unpleasant job.
And that is where professional oven cleaning starts to make sense.
When DIY Oven Cleaning Is Not Worth the Effort
DIY cleaning is perfectly reasonable when the oven has light or moderate build-up.
Professional cleaning becomes more attractive when:
- Grease has accumulated for months or years
- Burnt-on food covers large areas
- The oven produces unpleasant smells when heated
- Racks are heavily coated with grease
- The door glass is badly stained
- Previous cleaning attempts have failed
- You do not want to spend several hours scrubbing
There is also a difference between making an oven look better and carrying out a detailed clean of the appliance.
Why Professional Oven Cleaning Can Be Better
Professional oven cleaning is designed specifically for heavy grease and carbonised food residue.
At Keen Clean, technicians use professional equipment and cleaning products designed for oven cleaning rather than relying on a general-purpose household spray. The service covers the oven interior, door and glass, racks, panels and other accessible components according to the appliance and its condition.
A professional cleaner can also assess the appliance before applying products, helping to avoid unsuitable treatments on sensitive surfaces.
This is particularly useful when an oven has been neglected for a long period or needs to be brought back to a much cleaner condition before a property inspection.
What About Self-Cleaning Ovens?
A self-cleaning oven does not necessarily mean you never need to clean it manually.
Pyrolytic ovens use extremely high temperatures to turn food residue into ash, which can then be wiped away. However, manufacturers’ instructions still need to be followed carefully.
Some commercial oven cleaning products are unsuitable for self-cleaning ovens, and Which? warns that certain chemicals can become reactive at the high temperatures used during pyrolytic cleaning.
If you have a self-cleaning oven, always check the manufacturer’s instructions before applying any chemical cleaner.
How Often Should You Clean an Oven?
The right frequency depends on how often you cook and what you cook.
A household that regularly roasts meat, bakes or prepares dishes that splatter may need to clean the oven considerably more often than someone who uses it occasionally.
Current UK advice suggests that regular cleaning helps prevent grease from becoming carbonised and difficult to remove. Which? recommends a more thorough clean around once a month, with quick attention to obvious spills after cooking.
The important point is that small amounts of grease are much easier to remove than years of accumulated residue.
How to Prevent Burnt-On Grease Building Up
A few simple habits can make future oven cleaning considerably easier.
Wipe spills once the oven has completely cooled.
Use baking trays underneath dishes likely to bubble over.
Cover foods that splatter heavily.
Clean the oven regularly rather than waiting until it becomes extremely dirty.
Keep racks clean before grease becomes heavily baked on.
Check the manufacturer’s cleaning instructions.
These steps will not eliminate the need for deep cleaning, but they can significantly reduce the amount of hard-to-remove residue.
When Should You Book Professional Oven Cleaning?
If your oven has reached the stage where you are spending more time scrubbing than actually getting results, professional cleaning is worth considering.
It is particularly useful before moving out of a property, after a long period without cleaning, or when heavy grease and burnt-on food have accumulated throughout the appliance.
Keen Clean’s professional oven cleaning service in London covers London boroughs within and around the M25 and includes cleaning the oven door, glass, interior, racks and other parts of the appliance.
The main advantage is simple: instead of spending hours trying different DIY methods, you can leave a heavily soiled oven to someone equipped to deal with it.
Frequently Asked Questions
Q: How do you remove burnt-on grease from an oven?
A: To remove burnt-on grease, first soften the residue with steam or a suitable oven-cleaning treatment. Bicarbonate of soda can help with moderate build-up, while specialist oven cleaners are more effective for stubborn grease. Avoid aggressive scrubbing and abrasive products on sensitive surfaces such as oven glass.
Q: What is the best cleaner for burnt-on oven grease?
A: A dedicated oven cleaner is generally more effective against heavy burnt-on grease than ordinary kitchen cleaning sprays. However, products vary considerably, and some are unsuitable for glass, aluminium, heating elements or self-cleaning ovens. Always follow the manufacturer’s instructions and use appropriate protective equipment and ventilation.
Q: Can bicarbonate of soda remove burnt-on grease from an oven?
A: Yes, bicarbonate of soda can help loosen moderate grease and baked-on food when made into a paste with water and left for several hours. However, it may struggle with thick, carbonised deposits that have accumulated over a long period. It should also not be used abrasively on oven glass.
Q: When should I get my oven professionally cleaned?
A: Consider professional oven cleaning when grease and burnt-on food have accumulated heavily, DIY methods have failed, or cleaning the appliance would take several hours. Professional cleaning is particularly useful before moving out, after prolonged neglect, or when you want the entire appliance cleaned without spending a day scrubbing.
Final Thoughts
Burnt-on oven grease does not always require professional cleaning. For fresh spills and moderate build-up, steam, bicarbonate of soda or an appropriate oven cleaner can often make a noticeable difference.
The situation changes when grease has been repeatedly baked onto the oven for months or years.
At that point, aggressive scrubbing may damage surfaces while still leaving residue behind. Professional oven cleaning offers a more practical solution for heavily soiled appliances and can save considerable time and effort.
The best approach is therefore simple: clean small spills regularly, treat stubborn grease carefully, and call a professional when the DIY approach stops being practical.
