Preparation materials: detergent, empty cups, plastic bottles, clean water and chopsticks.

1. Pour the empty cup into clear water first.

2. Pour a small amount of detergent and mix well with chopsticks.

3. After stirring evenly, put the Swarovski necklace into the solution and wait for about 40 minutes.

After 4.40 minutes, pour the necklace and detergent solution into the empty bottle.

5. After pouring, shake the mineral water bottle back and forth 1 min.

6. 1 minute later, take out the necklace in the bottle and wash it with clear water. It can be found that the blackened necklace has become shiny again and is no longer blackened.