Unfortunately, there's not any good built in way to do it in Confluence, so I wrote a user macro to help:
https://bitbucket.org/stephendeutsch/confluence-user-macros/src/bb28804121a99ccd01b95d0ebed4097468d0244d/bulk%20remove%20watchers/remove%20watches%20for%20user.vm?at=master
Maybe it will work for you.
I've been using this (free) plug-in:https://marketplace.atlassian.com/plugins/it.logontec.dev.watchremover
See if you find this helpul:
https://confluence.atlassian.com/display/DOC/Managing+Watchers
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