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 4.05.4250 (26 Aug 2013):
- Added Windows Server 2012 R2 Preview support.
- Added Windows Event Log cleaning.
- Updated Intelligent Cookie Scanning.
- Improved behavior when removing System Restore points.
- Improved Windows XP last download location cleaning.
- Enhanced the File Finder function keyboard navigation.
- Improved privacy data cleaning for multiple users in Internet Explorer 11 (CCleaner Professional).
- Improved the time interval options for system monitoring (CCleaner Professional).
- Updated exception handling and reporting architecture.
- Added Adobe Premier Pro CC, OpenOffice 4, CuteFTP 9, and Directory Opus 10 cleaning.
- Improved Foxit Phantom PDF and QuickTime cleaning.
- Minor GUI improvements and bug fixes.