How to Clean Burnt-On Grease From a Baking Tray

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

Why does grease become so baked on to a baking tray?

Fat that runs from food loses moisture, oxidises and hardens each time it is heated. Around the edges and in the corners, where heat builds up, these remnants create an adhesive layer that a quick wash with ordinary washing-up liquid will not remove.

Scraping a dry baking tray with a knife, steel wool or a rough scourer can scratch the metal and ruin its coatings. Soaking it for longer lets the residue absorb moisture, reducing the force required and protecting the surface while cleaning.

Key precautions before cleaning include:

• Temperature: wait until the tray is merely 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: avoid steel wool, knives and 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 resistant it is likely to become.

Before using any mixture, establish whether the item is aluminium, stainless steel, glass, enamelled, or has a non-stick coating. Different materials react differently, so the manufacturer’s instructions should determine suitable products, contact time and scrubbing.

How can you remove burnt-on grease with bicarbonate of soda and vinegar?

For uncoated metal baking trays, make a paste using bicarbonate of soda and a small amount of water, spread it over the cooled areas and leave it for several hours. Afterwards, apply a little vinegar to help release the loosened residue.

Let the paste work before adding vinegar

Combining everything in advance reduces its effectiveness. The bicarbonate of soda should stay on the grease for a few hours to soften the baked-on layer. Use only a little vinegar at the end, scrub gently and rinse thoroughly so that no residue remains.

Bicarbonate of soda and vinegar react with one another and lose some of their effectiveness when mixed beforehand. Therefore, allow the paste to work first, use vinegar only at the final stage, scrub with a soft sponge and rinse the tray fully.

Clean it in this order:

• remove loose remnants with kitchen roll or a silicone spatula;
• mix bicarbonate of soda with a little water until it forms a paste;
• spread it over the grease and leave it to work for several hours;
• apply a small amount of vinegar only at the final stage;
• scrub with a soft sponge, rinse and dry completely.

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, steel wool, abrasive powders and scrapers can cause scratches, reduce the non-stick finish and lead to the coating peeling.

Wash the tray while it is warm, 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 item:

• 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;
• do not use steel wool, knives or abrasive powders;
• replace the item if the coating is peeling.

How can you stop grease building up again?

Anyone familiar with ways to remove built-up grease from a hob using bicarbonate of soda should remember that a baking tray may have a different coating. Before applying homemade solutions, always confirm compatibility and carry out a small, discreet test before full use.

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