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。
Changes in CCleaner 3.21.1767 (25 July 2012):
- Added support for Windows Server 2012.
- Added Opera plug-in cache cleaning.
- Added benchmarking for Cleaner summary results.
- Improved Startup Tool loading algorithm.
- Improved Drive support in Drive Wiper tool.
- Improved Font Cache cleaning.
- Improved Wildcard behavior in search boxes.
- Improved System Restore discovery.
- Improved Windows 8 identification.
- Added cleaning for Universal Extractor.
- Updated Internet Download Manager cleaning.
- Added Tatar translation.
- Minor GUI improvements and bug fixes.
