Removing unsed cert from Let's encrypt

Few months ago, I delete unsed AKS cluster in kubernetes. But the Let’s encrypt certificat is still listed.
Any help on how to remove those certificat.

My domain is: itsolutions-notif-system.eastus.cloudapp.azure.com
scdf-rancher.eastus.cloudapp.azure.com

My hosting provider, if applicable, is: I’m using AKS.

listed where?

if it's in your acme client, you should read its documentation.

if it's in certificate transparency logs, it's there to stay.