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I installed an app that stores a persistent identifier in the iOS keychain, even after uninstalling and reinstalling it. This really bugs me. Is there a way to delete said app's data from the Keychain, or worst-case resetting the entire iOS Keychain, without resetting the device completely?

Note: I'm not talking about the iCloud Keychain, but the on-device keychain that apps can store small bits of data in.

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Have you tried this link? I'm pretty sure this is the answer you're looking for, this link tells you to;

1) Open the Mac Keychain. Click Finder > Go > Utilities > Keychain Access.

2) In Keychain Access, select the Passwords category on the left to review the list of sites and services for which you've saved a password.

3) Right-click the service you want to edit/remove, then left-click Delete.

https://answers.uillinois.edu/68546

If you're looking to get rid of sandbox,

1) Quit sandbox as well as its related process(es) if they are still running.

2) Launch Finder on your Mac, and click Applications in the Finder sidebar.

3) Search for sandbox in the /Applications folder, then drag its icon to the Trash icon located at the end of the Dock, and drop it there. Also, you can right-click/control click sandbox icon and then choose to Move to Trash option from the sub-menu.

4) If prompted, enter the administrator password and hit OK to allow the change.

5) Choose Finder > Empty Trash from the Menu bar. Or choose right-click Trash icon, choose Empty Trash, and Empty Trash again in the pop-up dialogue.

https://macuninstallguides.com/remove-sandbox-on-mac.html

(Note, you don't have to install any apps to remove it)

If you want to reset the entire keychain, I recommend that you take a look at the answer on this page.

How do I delete or fix my Keychain after changing my password?

  • Welcome to Ask Different and thank you for your answer. :) Unfortunately, just providing links isn't very helpful as they may no longer work in future. Instead, could you please edit your answer to include a summary of the main content you're linking to? This will make your answer more self-contained and help preserve it for other users in future. – Monomeeth Sep 3 at 5:32
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No. Application sandboxing means these entries are stored in a way another app cannot reach them to clean. I suppose you could jailbreak the device if you had to purge things.

I totally get the annoyance - it’s your data and your device, so it’s frustrating to not be able to control it, especially since cookies and local store is a privacy issue persisting data when an app is removed.

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