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 5.36.6278 (October 24, 2017):
Browser Cleaning
Firefox: updated Session cleaning rule to support changes in Firefox 56.0
Chrome (and Chromium): updated Internet History cleaning rule to clean user activity data
Opera: updated Internet History cleaning rule to clean user activity data
Default Cleaning Rules
Windows Explorer: Most Recently Used documents and other MRU files no longer cleaned by default
Windows Defender: Scan history no longer cleaned by default
Microsoft Office: MRUs no longer cleaned by default
Edge, Chrome/Chromium, Firefox, Opera, Safari, Thunderbird: Current session data no longer cleaned by default
Emergency Updater
Added new executable: “CCUpdate.exe”
Added new Windows Scheduled Task: “CCleaner Update”
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