The tab of the Application tab in Chrome DevTools has a Work Service panel, and with it you can manually delete unnecessary ones. (By default, it will only show those service workers who are currently in scope, but if you select the "Show all" checkbox, you will see all of them.)
In older versions of Chrome, only chrome://serviceworker-internals/that is still supported and can be used for the same purpose, but you will probably find the DevTools interface more friendly.
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