System Ninja 需要 Microsoft .NET Framework 3.5 安装才能使用，win7自带，win8木有。
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System Ninja is a simple yet powerful cleaning app that scans your system and helps you get rid of junk files, and also performs other optimization tasks.
Though not as feature-rich as other similar programs likeCCleaner, System Ninja does its job and does it well. The program scans your system for all sorts of elements, from cookies and recently opened documents to internet history and temporary files.
Using System Ninja is really simple: run the app and click the Scan Drivebutton. The junk scanner will sweep your computer in search of all the files that can be safely deleted to recover hard drive space and speed up your computer. When the list is full, you can check which ones you want to delete. Remember, though, that System Ninja doesn’t create a backup before you delete those files.