DeleteAll 無效
檢查下 設置的 公司名稱 和項目名稱 是否是中午！！！！！改成英文即可
各平臺保存路徑
On Mac OS X PlayerPrefs are stored in ~/Library/Preferences folder, in a file named unity.[company name].[product name].plist, where company
and product names are the names set up in Project Settings. The same .plist file is used for both Projects run in the Editor and standalone players.
On Windows, PlayerPrefs are stored in the registry under HKCU\Software\[company name]\[product name] key, where company and product names are
the names set up in Project Settings.
On Linux, PlayerPrefs can be found in ~/.config/unity3d/[CompanyName]/[ProductName] again using the company and product names specified in
the Project Settings.
On Windows Store Apps, Player Prefs can be found in %userprofile%\AppData\Local\Packages\[ProductPackageId]>\LocalState\playerprefs.dat
On Windows Phone 8, Player Prefs can be found in application's local folder, See Also: Windows.Directory.localFolder
WebPlayer
On Web players, PlayerPrefs are stored in binary files in the following locations:
Mac OS X: ~/Library/Preferences/Unity/WebPlayerPrefs
Windows: %APPDATA%\Unity\WebPlayerPrefs
公司名，項目名必須爲英文，否則刪除還是不管用
參考
http://docs.unity3d.com/ScriptReference/PlayerPrefs.html