This video shows how to delete all completed tasks in Reminders app of iOS (iPhone, iPad). How to use Shortcuts app of Apple to do this task.
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Special thanks to HowToGeek for their article: How to Delete All Completed Reminders at Once on iPhone and iPad
https://www.howtogeek.com/686386/how-...
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Chapters:
0:00 - Introduction
0:26 - Step 1: Install Shortcuts app.
0:56 - Step 2: Setup button "Reminders Cleaner".
2:15 - Step 3: Use button "Reminders Cleaner" to delete all completed tasks.
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iOS version in the video: 12.2