How to completely delete Keychain passwords?

[Tamagotchi]

Hi,

I've opened keychain and deleted all passwords from both iCloud and login items. I would expect that everything I have on my keychain has been deleted. However if I format my Mac, and give it access again, or allow a new Mac to access my Keychain those items that I had deleted reappear...

Is there anyway to completely wipe and delete everything?

Many thanks!

 

[Tamagotchi]

Ok, I managed to do it.

Not very sure how...

I deactivated Keychain on all my iPhone's, iPad's, etc. Except for my main Mac. Deleted/signed out from iCloud on those same devices. Opened Keychain on my mac, deleted everything and then reset my default keychain. Opened the folder with the default Keychain (and it's copy), deleted that too. Finally, on iCloud preferences in my Mac I changed my security code, my phone number (I have a new phone number), an signed out from iCloud on my mac. Restarted, signed back in and... voila! One of those steps must have clicked and after the restart there are no more of my passwords stored on iCloud.