I've installed Subversive and want to switch to the Subclipse plugin.
After uninstalling Subversive via About Eclipse -> Installation Details -> Uninstall... and installing Subclipse, there are now two SVN options available in Preferences -> Team, one for Subversive preferences (which has been uninstalled and shouldn't be there anymore), and one for Sublipse preferences.
How to remove Subversive completely, so that there aren't any traces (such as Subversive's preferences screen) left in Eclipse?
Remove from Eclipse's plugins and features folders all files and folders like:
org.eclipse.team.svn*
org.polarion.eclipse.team.svn*
Help->about eclipse->installation details->Installed Software tab You can choose the software to uninstall.
If you have installed Subversive via Eclipse Marketplace:
From Eclipse menu open Help -> Eclipse Market Place...
Then search for subversive, click uninstall under Subversive - SVN Team Provider
Restart the Eclipse.
来源：https://stackoverflow.com/questions/6979470/how-to-fully-remove-subversive-plugin