How to Remove Burnt Grease From Your Oven

Understanding What You're Dealing With

Fresh grease — a recent spill or splatter — is relatively easy to clean. The problem is when grease is heated repeatedly without being cleaned. Each heating cycle bakes it further into a layer of polymerised carbon. After several cycles, you have a hard, black deposit that won't dissolve in water and resists most surface cleaners.

This is why regular cleaning matters so much. The longer you leave it, the harder it becomes to remove — and the more aggressive the cleaning method required.

The Bicarbonate of Soda Method

For mild to moderate grease build-up, a bicarbonate of soda paste is the safest and most effective DIY approach. Mix bicarb with just enough water to form a thick paste, apply generously to all affected surfaces, and leave for at least 4 hours — or overnight for stubborn deposits.

The bicarb breaks down the grease through a mild alkaline reaction. Wipe away with a damp cloth, rinse thoroughly, and repeat if necessary. This is completely safe, non-toxic, and won't damage oven surfaces.

Using Oven Cleaner Sprays Safely

Commercial oven cleaners are effective but require careful use. Most contain sodium hydroxide (caustic soda), which is highly alkaline and breaks down grease quickly but produces strong fumes and can cause skin and eye irritation. Always use rubber gloves, ensure good ventilation, and keep children and pets out of the kitchen.

Never use caustic oven cleaners on self-cleaning ovens, aluminium parts, oven seals or the fan element. Check your oven manual for any specific warnings before applying any chemical cleaner.

The Dip-Tank Approach

Removable parts — racks, shelves, the grill pan and side runners — are the most time-consuming to clean by hand. The professional approach is a heated dip-tank: a tank of bio-degradable solution heated to around 60°C, into which all removable parts are submerged.

The heated solution dissolves even the most heavily carbonised grease over 20–30 minutes, leaving parts that can be wiped clean in seconds. This is impossible to replicate at home but is what separates a professional result from a DIY one.

When to Call a Professional

If you've tried the bicarb method and the oven is still heavily soiled, or if the build-up is several years old, it's worth calling a professional cleaner. Attempting to remove very heavy carbon with harsh chemicals or abrasive scrubbing risks scratching oven enamel, damaging the door seal, or voiding your appliance warranty.

A professional clean costs from £50 for a single oven and typically takes 1.5–2 hours. For most households, it's the most time-efficient and cost-effective way to get back to a truly clean oven.