TIL you can purge the 1.1.1.1 DNS Cache on Cloudflare

Cloudflare offers a tool for that:

1.1.1.1’s Purge Cache tool allows you to refresh 1.1.1.1’s DNS cache for domain names. To refresh the cache for a domain name, enter the name for the domain below, pick the DNS record type and then hit the Purge Cache.