Check Redundant Open And Mute
This plug-in checks for redundant open and mute markings. It checks articulation markings (> and +), Italian text (con sord./sordino and senza sord./sordino), and English text (open/unmute/unmuted and mute/muted/closed).
For text, you can choose to Hide, Select, or Delete the redundant markings. For articulations, you can choose to Delete or Locate Only. There is the additional option to locate them to the trace window or to a user-specified log file.
If you spend any amount of time dealing with brass sections or string sections, this plugin will serve you well.