OldChromeRemover is a simple console program that checks for any redundant versions of Google Chrome left behind by the updater. It will quickly remove all except the newest version when prompted by the user, allowing you to free up valuable disk space. OldChromeRemover also supports Chrome ‘Canary’ builds. This tool is for Windows users only, however a similar app (by somebody else) for Mac OSX users can be found here.

Microsoft .NET 3.5 must be installed to use. System Ninja contains the functionality of this program build into the scanner, and is recommended over OldChromeRemover. Windows Vista/Windows 7 users must use “Run As Administrator.”
Now over 40,000 downloads!
Do not use if you have multiple Chrome channels installed simultaneously!
Advanced usage
You can silently run OldChromeRemover using the “/AUTO” command line argument. This will silently perform the scan, remove any detected directories and files, then exit the program.
Changelog
Version 0.1: Initial release
Version 0.2: Added ‘\AUTO’ commandline switch support
Version 0.3: Added removal support for old_chrome.exe file and Chrome Canary builds.
Version 0.4: Improved detection on x64 Windows.
Version 0.5: Fixed ‘Version string length’ error for most users.