Use 5- 10g of salt, put it in an open water bottle (put some pieces of paper when there is too much scale), then pour in 100ml of water, then cover the bottle cap and shake it for a while, and the scale will fall off. Then pour off the scale and wash the thermos bottle with clear water.
2. Vinegar decontamination method:
Pour 250 grams of hot vinegar into an open bottle, cover the bottle cap tightly, gently shake it and let it stand for half an hour to remove the scale.
3. Black liquor descaling method:
Heat a proper amount of white wine and put it into a boiled water bottle, soak it for a few hours, then pour it out, and the scale will fall off, and then rinse it with clear water.
4. Dilute hydrochloric acid descaling method:
Pour 200 ml of dilute hydrochloric acid, or 50 kg of baking soda and a glass of water into an open bottle and shake it gently for a while to remove the scale.
5. Crushed eggshell descaling method:
Put the broken egg shell into an open water bottle, then pour a few drops of detergent and appropriate amount of water, cover it and shake it up and down, and finally rinse it with clear water.