Ive added a new domain at upon scan it got 600 CNAME records, Ive tried different NS then adding but it keeps showing them, how to delete them in mass/fix it?
Welcome to the Cloudflare Community. 
You probably had a wildcard record in your old DNS which means that every name Cloudflare tested came back positive.
You can use the Cloudflare API to empty out your zone all at once. You can use this utility written by an MVP Community member if you aren’t prepared to rite your own script.
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