Or disable it completely, it is not needed these days and it can be used in exploits or in salvaging privacy information.
An interesting thread about this: https://www.wilderssecurity.com/threads/dns-cache-list-flush-disable.390302/
This is what I do but I only bother when something is cached with the wrong address. I don't see the point of disabling it. If you think the party running the DNS server isn't logging your every request you are mistaken.