Method
I sprinkle 50 grams of baking soda    on the baking tray to    perfectly cover any stains    .
Then I set the result aside and    fill a pot with vinegar    and heat it on the stove until    it almost boils    .
Nowadays    I always open the window because the vinegar gives off a strong smell    . This way the kitchen won’t be filled with the smell of vinegar and mixture.
Once it’s almost boiling,    I pour the vinegar over the baking soda and let the mixture sit for about 60 minutes    .
After about an hour,    I put on gloves and scrub the pan with a sponge    to remove any stains and crusts.
The result is significantly better than if I had used a commercially available product.
On the other hand, to clean the edges, I rub with a little more force    to remove all the dirt.
In the end, the pan looks perfectly clean, almost like new.
Have fun cleaning.