FOR THOSE OF YOU WHO ASKED HOW I DID IT!
I boiled 1 liter of distilled water, added 2 parts of white vinegar, 1 part of baking soda. Two cups of Coca-Cola, a dishwasher tablet, and half a lemon.
Shake it for 3 minutes, place the tank in the solution for 45 minutes, add a little chlorine in the mixture.
I then brushed it with a toothbrush and dipped it into the liquid again for 25 more minutes. Place it in the microwave for 3 minutes with muriatic acid, l rinsed it and it looked exactly the same so l just installed a new one.