Installed vBulletin? Upgraded vBulletin? Running vBulletin?

Here are a few tips to keep that install clean :)

You can remove the install/ directory

You can check to see if your includes/ directory has a config.php.new (if so, remove it!) Make sure you keep the required config.php file

Have any old styles you no longer use? Check their images/ directory and perhaps it is time to remove those obsolete image files.

Go to the Admin Control Panel and then maintenance and click on the diagnostics, from there you can run file diagnostics to see if any old renamed files from vBulletin are lying around. You can remove those if they're not from the same version. Note: If they report they're not the same version make sure you replace it with the files from the current version, maybe your FTP upload went bad.

If you have impex installed you can uninstall that too again

Of course, always backup before you make any changes, just in case you delete the wrong files! We don't want that.

And finally: Upgrade to the latest stable release, currently 3.5.4, it fixes bugs, security issues and helps you get the best priority support :)

Good luck, let me know if you also have any tips :)