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。ZOl提供CCleaner下载，CCleaner正式版官方下载安装。

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 3.25.1872新版更新日志：
- 增加谷歌的Chrome扩展管理。
- 改进了与Windows8和Windows Server 2012的兼容。
- 改进的安全管理Firefox插件。
- 改进的内部模块的加载速度。
- 增加了使用Adobe Dreamweaver，Corel X5和Anonymizer。
- 改进了对Microsoft Office 2010和ImgBurn。
- GUI导航的改进。
- 小错误修正。

CCleaner 3.24.1850新版更新日志：
1、增加Firefox插件和扩展管理；
2、优化64-bit Wins7和Wins8结构；
3、改进的Firefox cookie清理；
4、更快的自动更新专业版。
5、GUI用户界面的改进。
6、修正小错误。

CCleaner 3.20.1750:
- Added Windows Explorer Context Menu management to Startup tool.
- Added Windows 8 Release Preview compatibility.
- Added Opera 12 support.
- Updated History cleaning for Aurora.
- Updated History cleaning for Chrome Canary.
- Improved UAC bypass code.
- Improved accuracy for uninstall items installation date and size.
- Improved Scheduled Tasks detection.
- Improved cleaning algorithm duplication detection.
- Improved file and setting removal when uninstalling.
- Minor bug fixes.

CCleaner 3.19.1721:
- Added option to skip User Account Control (UAC) warning.
- Added support for Firefox 13.0 beta.
- Moved Thunderbird to be cleaned separately.
- Improved Aurora History cleaning.
- Improved Google Chrome Saved Passwords cleaning.
- Improved Scheduled Tasks detection.
- Improved Uninstaller Installation Date on XP.
- Added cleaning for BitDefender.
- Improved detection for Malwarebytes Anti-Malware, VLC Media Player and Avast! Antivirus 6.

CCleaner 3.18.1707:
- Added support for Firefox 12 final release.
- Added support for Google Chrome 20.0 beta.
- Added multi-select to detailed results view.
- Improved support for Internet Explorer 64-bit Add-ons.
- Improved folder detection algorithm for cleaning items.
- Improved scrolling interface for Include/Excluding dialogs.
- Improved compatibility with Windows 7 alt-tab functionality.
- Improved user interface for Drive Wiper Tool.
- Added cleaning for Corel VideoStudio Pro X5, MS Security Client and GIMP 2.8.
- Improved cleaning for OpenOffice 3, AIMP 3.
- Minor GUI improvements.
- Minor bug fixes.

CCleaner 3.17更新日志：
— Cookie清理已能支持通配符
— 改进谷歌Chrome浏览器表单清理
— 改进谷歌Chrome搜索历史清理
— 新增主机记录清理
— 新增支持Google Chrome Canary分支版本
— 改进Win7跳转列表清理
— 改进清理时自动关闭浏览器选项
— 改进IE自动完成表单历史和保存密码清理
— 改进Windows 8中的快捷方式清理
— 新增支持CyberLink PhotoDirector 10, DivX player和Snagit 11.
— 改进针对Vuze, Windows Media Center, Windows Media Player,
— Corel VideoStudio Pro X4和Game Explorer的清理
— 改进BitTorrent检测
— 其它细微Bug修复和改进

Changes in CCleaner 3.14.1616 (21 Dec 2011):
- Improved Startup tool usability.
- Improved IE Add-on management.
- Improved Import/Export for Cookies.
- Improved Recycle Bin cleaning and duplicated filenames.
- Updated Chrome Canary Saved Form Information cleaning.
- Updated Chrome Canary Saved Passwords cleaning.
- Updated Chrome Canary Cookie cleaning.
- Fixed bug in long filename extensions.
- Added cleaning for Chrome Canary “Network Action Predictor”.
- Added cleaning for Real Player 15, PerfectDisk 12.5 and Windows Media Center.
- Improved cleaning for WinRAR, Windows Log Files, uTorrent and Acrobat Distiller 10.
- Minor bug fixes.

CCleanerv3.08.1475 (27 Jun 2011)
- Added support for Firefox 5.0.
- Improve Firefox History cleaning.
- Improved cleaning for Windows Error Reporting and Other Explorer MRUs.
- Added cleaning for Ditto, Evernote, I2P, McAfee AntiVirus,
MS AntiMalware, PerfectDisk, PowerISO, UltraISO, GIMP,
Go!Zilla, MagicISO.
- Improved cleaning for 7-Zip, Daemon Tools, Windows Defender.
- Improved DOMStore cookie domain discovery and cleaning.
- Improved Uninstall tool scanning and uninstalling routines.
- Improved Registry Cleaner detection algorithm.
- Improved Start Up tool detection algorithm.
- Added multiple monitor support.
- Improved shortcut key accelerators.
- Improved search response when using wild cards.
- Added support for root registry keys in the exclude list.
- Added Kazakh language.
- Minor GUI improvements and fixes.

CCleaner 3.07.1457:
- Added Flash Player SOL setting file cleaning and management.
- Added Safari Icon history cleaning.
- Added cleaning for Windows Elevated Diagnostics.
- Added cleaning for Kantaris Media Player, KMPlayer, Orbit Downloader, Pando, Sandboxie and Snagit.
- Improved cleaning for XFire, Real Player, Windows Log Files, Macromedia Shockwave 10 and 11.
- Improved Google Chrome thumbnails and favicons cleaning.
- Improved Google Chrome Saved Form Information cleaning.
- Improved Google Chrome Save Passwords cleaning.
- Improved Opera Last Download Location cleaning.
- Improved Remote Desktop cleaning.
- Improved Recent Documents cleaning.
- Improved Exclusion functionality for Registry cleaning.
- Improved Registry cleaning for Windows Services.
- Improved Drive Wiper functionality and feedback.
- Fixed bug in Cookie importing/exporting.
- Minor translation fixes.

Changes in CCleaner v3.06.1433 (26 Apr 2011):
- Added HTML5 IndexedDB cleaning and management for Firefox and Chrome.
- Added HTML5 Offline cache cleaning and management for Opera and Safari.
- Added Firefox Site Preferences cleaning.
- Added Opera Last Download Location cleaning.
- Added Opera Recently Typed URLs cleaning.
- Added Opera Session cleaning.
- Improved Chrome Most visited Sites history cleaning.
- Improved Registry reading and cleaning algorithm.
- Improved Intelligent cookie scanning.
- Improved IE Temporary Internet Files cleaning.
- Improved IE History cleaning.
- Improved "Windows Service" registry issue detection.
- Improved "ActiveX and Class Issues" registry issue detection.
- Updated Google Chrome icon.
- Added cleaning for Core FTP, FileZilla, SmartFTP, A-Squared, MySpaceIM and MusicMatch Jukebox.
- Improved cleaning for CuteFTP.
- Minor bug fixes.