Use a paper towel to wipe away excess grease and loose dirt.
Pour boiling water into a sink or tub and add a cup of baking soda. Wait for bubbles to subside.
Place your tray in the sink and leave it to soak for an hour to let the solution soften the burn marks.
Drain the water and use a cloth or sponge to wipe away the softened crust – following the reaction between the hot water and baking soda, this should break down and come away easily.
If your tray wasn’t completely submerged first time around it may need further cleaning. Repeat the process with the tray turned over to focus on the remaining areas.
Give your tray a final clean in the sink or use a dishwasher for best results.
Spray baking tray with Tesco anti bac kitchen foaming cleaner with bleach. Leave for half an hour. Use a soft sponge to wipe away crust. Rinse thoroughly and/or put in dishwasher to remove remaining cleaner and bleach.