Uninstall won't remove everything for a plugin, firstly it will leave any plugin specific settings in place, these will be used on a re-install, and secondly on re-install the popup about which toolbars and menus should show the the plugin won't be popped (not sure if this is always true).
The plugin specific settings are easy to remove, after removing the plugin from calibre, look for a <pluginname>.* files in the calibre configuration folders plugins subdirectory; if found, delete them. Some plugins wont have any files, and many will only have a .json file, but some have extra files like an .html file for help etc.
The popop issue is harder, IIRC you have to edit the gui.json file and exorcise relevant entries. If on first install you chose to not show the plugin in any menus or toolbars then on subsequent re-installs that choice will still be in effect.
Would be nice if the plugin management sub-system had a Nuke Plugin option.
BR
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