How do I get rid of all traces of the LibreOffice plugin

The problem that I had with Zotero's LibreOffice toolbar icons disappearing (see https://forums.zotero.org/discussion/33118/libreoffice-plugin-nonfunctional-after-system-upgrade/) has reoccurred, this time with not obvious catalyst - ie no upgrades or reinstalls since I last got them back.

Poking about further in ~/.config/libreoffice it seems that my various reinstalls have left a lot of garbage. For example, there are 12 directories in ~/.config/libreoffice/3/user/uno_packages/cache/registry/com.sun.star.comp.deployment.configuration.PackageRegistryBackend that contain XML files that appear to describe different locations for the icon files.

Can anyone provide a definitive list of files that the plugin installs so that I can try and make sure everything is gone before I try another reinstall?
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