Don't feel guilty if your baking sheet is dirty beyond recognition. This is a mistake that is common and yet easily overlooked — at least until the dirtiness becomes glaring. Instead of ditching such a baking sheet, try one of these three fail proof methods:

1. Baking Soda And Hydrogen Peroxide

To use this method, first sprinkle some baking soda on the pan, letting it form a well-distributed layer across the pan. Then, spray on some hydrogen peroxide to wet the baking soda and let sit for about 2 hours. 

Afterwards, use a sponge to scrub the baking sheet, and rinse. If there are still some stains after these steps, repeat.

2. Cream Of Tartar And White Vinegar

Spread cream of tartar evenly across the surface of the baking sheet. Spray some white vinegar onto the spread and let the mixture dry on the baking sheet overnight or a minimum of at least eight hours.

After the long wait, add a little hot water to the sheet and give it a thorough scrubbing. Rinse with warm water and if needed, repeat the process.

The mixture of the cream of tartar with an acidic liquid like white vinegar creates a potent cleaning paste that can remove tarnish and grease from metals like aluminum, brass, and copper and restore their shine!

3. Bar Keepers Friend

Bar Keepers Friend contains oxalic acid which easily degenerates the molecular bonds that cause tarnish, rust, and other tough stains, leaving the surface with a dazzling luster.

To use, pour some Bar Keepers Friend to a grimy sheet pan and scrub with a sponge or brush. Instructions on the package directs that the substance shouldn't be left on a surface for more than a few minutes. So, it is best advised that you clean the pan in smaller sections one at a time, rinsing each section thoroughly with warm water after scrubbing.

WARNING: if your baking sheet has a non-stick coating, you should avoid using harsh scrubs as those mentioned above. Instead, stick to giving the pan a warm soak and a light wash using a soft sponge.