You could do this with the Confluence Command Line Interface plugin - https://marketplace.atlassian.com/plugins/org.swift.confluence.cli - which has a removeComments (https://bobswift.atlassian.net/wiki/display/CSOAP/Documentation#Documentation-removeComments) command.
Would that work for you?
Ah, ok. There are couple of open feature requests (https://jira.atlassian.com/browse/CONF-3902 and https://jira.atlassian.com/browse/CONF-5023) relating to bulk deleting comments via the web interface, but they haven't been implemented yet. Alternatively, anyone with the remove comment permission on a space can delete the comments one by one.
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