A few days back I covered a tool called Tray Cleaner that allowed users to remove all past notification area icons, but sadly there was some trouble using it in Windows 7. It did not remove the icons completely. So today I am going to share with you another method that has been tested to work.
This method requires editing the Windows Registry. If you’re using Windows 7, type regedit in Start Search, right-click it to select Run as administrator to launch Registry Editor.
Now, navigate to the following key from the left sidebar:
From the main window, delete both IconStreams and PasteIconsStream.
Now hit Ctrl +Alt + Del to open Task Manager and kill explorer.exe process. Once done, go to File > Run, enter explorer.exe and hit Enter, this will start explorer.exe again.
Now right-click the clock in the system tray and hit Customize notification icons. You will see that all past icons have now been removed.
For those who don’t know what are past notifications? Go here to learn about it. Enjoy!