How to remove a chat entirely from whatsapp?

I have added a person to my Whatsapp list. Now I would like to remove her from my Whatsapp (to bring it back to the state as if I never chatted with that person). You might think “So easy, just remove the chat and the contact”, but it’s not that simple:

  • When I remove the chat, only the content of the chat is removed, but the number is still is my Whatsapp list.
  • When I remove that person from my contact list, that makes no difference.
  • When I block that person, Whatsapp mention that person being blocked.

Is there no way to remove a person and the corresponding chat from my Whatsapp?