How to remove non-existing subdomains from google index?

Question

Google

The site has no traffic from google. I check the index, there are found non-existing subdomains on a completely different topic, and the site has only a face in the index. I check in the search console, there are no manual actions taken.
Who faced this and what did they do? How to remove non-existing subdomains from google index?

Answer 1

https://support.google.com/webmasters/answer/16634...