Thanks to PastIcons Flusher you can clear your previous list of icons in the 'Customize Notifications' dialog. This dialog is located in the tartare options area, in Windows XP.
If this list of icons has gotten out of hand, it has become a chaos when adding and removing objects over time and you don't know how to order it conveniently, it is best to clean it completely and start building it from scratch. To do this, you must use this Past Icons Flusher.
Past Icons Flusher is a completely free tool that occupies a practically insignificant amount of disk space: just 20 Kb in size.
You can free download Past Icons Flusher 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.