For those wondering, ′′ how did i do it?":
I Boiled 10l of water, added 2 tablespoons of vinegar, 1 teaspoon of sodium bicarbonate, two cups of coke and half cup of lemon juice then stirred well .
Waited 3 minutes, put the pan in the solution for 45 minutes, then added a quarter cup of chlorine bleach to the mixture.
Then I brushed it with a firm toothbrush and put it back into the liquid for another 25 minutes. I took it out, rinsed it and it looked exactly the same, so I threw it away and went out and bought a new one.