1. Clear chat records: In the chat interface of official WeChat account, you can press and hold a chat record, and then select "Delete Chat Record" to delete all chat records, so that these records can no longer be displayed in official WeChat account.

2. Cancel the attention: You can consider canceling the attention to this official WeChat account. After you cancel your attention, you will not be able to leave any records in this official WeChat account.

3. Clear the cache: You can try to clear the cache of your mobile phone. In the settings of the mobile phone, select "Storage" or "Application Management" to find the application in the official WeChat account, and then select "Clear Cache" or "Clear Data". This will clear all the records of the official WeChat account stored in the mobile phone.