CCleaner是一款免费的系统优化和隐私保护工具。CCleaner的主要用来清除Windows系统不再使用的垃圾文件，以腾出更多硬盘空间。它的另一大功能是清除使用者的上网记录。CCleaner的体积小，运行速度极快，可以对临时文件夹、历史记录、回收站等进行垃圾清理，并可对注册表进行垃圾项扫描、清理。附带软件卸载功能。
CCleaner v2.24.1010更新
- Added support for Firefox 3.6.
- Added file search history cleaning for Windows 7.
- Improved Opera 10 cleaning.
- Reduced temp folder cleaning delay to 24 hours.
- Several bugs fixed to better support Windows 7.
- Added winapp2.ini filter support to detailed results view.
- Improved 64-bit support for Registry Cleaner.
- Fixed minor bug in Uninstall Tool.
- Fixed minor bug in System Restore Tool.
- Minor interface bugs fixed.
- Minor display bugs fixed.