Removing Google Home Mini and the adding back

Configuration
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I have several Google Home Minis and it’s all gotten a bit of a mess with duplicates and non-functioning groups.

What is the best way to:

  1. Remove them from Home assistant.
  2. Remove them from my Google Account.
  3. Factory reset them (I know how to do this)
  4. Add them back to Home Assistant.

I’m guessing that the order and sequence is key here and I don’t want to lose auto discovery once they are all reset.