How to Clean Burnt-On Grease From a Baking Tray

A baking tray collects fat, sugar and sauces that are exposed to repeated heating cycles, creating dark stains that are difficult to shift. The most effective approach is to soften the baked-on layer before scrubbing and tailor the cleaning method to the tray’s coating.

Why does grease become so firmly baked onto a baking tray?

Fat released by food loses moisture, oxidises and hardens when heated again and again. Around the edges and in the corners, where heat is more concentrated, these deposits create an adhesive layer that ordinary washing-up liquid cannot remove with a quick wash.

Trying to scrape a dry baking tray with a knife, wire wool or a harsh scourer can scratch the metal and ruin its coatings. Leaving it to soak gives the grime time to absorb moisture, reducing the force needed and protecting the surface while cleaning.

The main precautions to take before cleaning are:

• Temperature: wait until the tray is only warm before washing it.
• Sponge: always use the soft side to prevent scratches.
• Bicarbonate of soda: use it sparingly and only on compatible materials.
• Instructions: check the guidance for coated baking trays.
• Abrasives: do not use wire wool, knives or metal scrapers.

Why does oven heat make residue harder to remove?

An oven is an enclosed appliance that retains heat at high temperatures, cooking food while also setting splashes onto the baking tray. The more often grease is reheated, the darker and more stubborn it is likely to become.

Before using any mixture, establish whether the tray is aluminium, stainless steel, glass, enamel or has a non-stick coating. Different materials react differently, so the manufacturer’s instructions should determine which products to use, the contact time and the amount of scrubbing required.

How can burnt-on grease be removed with bicarbonate of soda and vinegar?

For uncoated metal baking trays, make a paste from bicarbonate of soda and a small amount of water, spread it over the cool areas and leave it for several hours. A little vinegar can then be used to help lift the loosened residue.

Let the paste work before adding vinegar

Mixing everything in advance reduces its effectiveness. The bicarbonate of soda should stay on the grease for several hours to soften the baked-on layer. Apply only a small amount of vinegar at the end, scrub gently and rinse so that no residue remains.

Bicarbonate of soda and vinegar react with one another, losing some of their effect when combined too soon. For this reason, allow the paste to work first, use vinegar only for the final stage, scrub with a soft sponge and rinse the tray thoroughly.

Clean in the following order:

• remove loose food remains with kitchen roll or a silicone spatula;
• combine bicarbonate of soda with a little water to make a paste;
• spread it over the grease and leave it to work for several hours;
• add a small amount of vinegar only at the final stage;
• scrub with a soft sponge, rinse and dry fully.

How should non-stick baking trays be cleaned without damaging the coating?

Non-stick baking trays need a gentler method: warm water, mild washing-up liquid and the soft side of a sponge. Concentrated bicarbonate of soda, wire wool, abrasive powders and scrapers can cause scratches, reduce the non-stick performance and lead to the coating peeling.

Wash the baking tray while it is warm, but never when it is hot enough to cause burns or thermal shock. At this point, the grease has not fully hardened and will usually come away with less effort, helping to preserve the corners, edges and finish.

To look after a non-stick tray:

• soak it in warm water with mild washing-up liquid;
• use only a soft sponge or microfibre cloth;
• soak it again rather than scraping at stubborn residue;
• never use wire wool, knives or abrasive powders;
• replace the tray if its coating is peeling.

How can grease be prevented from building up again?

Anyone familiar with ways to remove built-up grease from a hob with bicarbonate of soda should remember that a baking tray may have a different coating. Before trying homemade cleaning methods, always check compatibility and carry out a discreet test before treating the whole tray.

Baking parchment helps prevent doughs, cheese and sauces from coming into direct contact with the baking tray. Foil may also be used when the recipe and manufacturer allow it, but highly acidic or salty foods require care; wash the tray promptly after baking.