如何防止在退出时在系统托盘中留下图标？

My program puts an icon in the system tray because the user may minimize to it. However, if the application crashes, or I stop the app from running in VS it leaves the icon in it until I hover over it with the mouse. Sometimes I'll look down there and there will be 10 or so icons. My program puts an icon in the system tray beca