1. Open WeChat on Redmi k40 mobile phone and click "My" in the lower right corner of the page.

2. Go to WeChat personal page and click "Settings" at the bottom of the list.

3. After entering the settings page, click "General" to make relevant settings.

4. Go to the "General" page and click "Storage Space" at the bottom.

5. Then on the "Storage Space" page, you can see the percentage of used space and mobile phone memory. Click the "Clear Cache" button to directly clear the cached data of WeChat.

6. The cache files of 6.QQ and Tik Tok can be cleaned by the same steps.