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 4.03.4151:
- Added command line option to reboot after cleaning (/AUTO /RESTART).
- Improved Firefox cleaning: Site Preferences, History and Startup items.
- Improved Internet Explorer 10 cleaning: Saved Passwords, Userdata Cookies and Last Download Location.
- Improved Internet Explorer 9 Last Download Location cleaning.
- Improved Opera Cache cleaning.
- Updated Startup items detection for Firefox and Google Chrome.
- Added Cookie management for multiple users (Pro Version).
- Improved Startup item management for multiple users on Windows 8 (Pro Version).
- Added cleaning for Express Scribe, Gom Player, Skype Metro App, Twitter Metro and Adobe Reader Touch.
- Improved cleaning for Microsoft Office 2013.
- Added Thai translation.
- Improved localization and language support.
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