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There seems to be no way to do this, anyone has an idea? There also seems to be some chrome plugins that offer solutions, although I tried a few and none worked, and some methods I've seen on medium are outdated with slack's updates to the application process.

grandisonan
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    Does this answer your question? [Slack clean all messages (~8K) in a channel](https://stackoverflow.com/questions/32824336/slack-clean-all-messages-8k-in-a-channel) – flaxel Oct 01 '20 at 14:47
  • @flaxel One can no longer generate legacy tokens. – André Haupt Oct 17 '20 at 07:12

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Note: It's not possible to bulk delete messages. Owners and admins can delete a channel to remove all its messages. Owners on paid subscriptions can also set a retention policy to automatically delete messages after a certain amount of time.

https://slack.com/intl/en-au/help/articles/202395258-Edit-or-delete-messages

Harry Bosh
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