My Notification area I was able to clean up by deleteing every single message.
A delete all messages button would be great.
The activity feed however I am not able to clean up and I already have 3 pages filled with messages as you can see.
It would be great to delete everything there as well if desired so I am more in power to keep an overview about
information I deem important to me.
I could see this being a serious issue when you try to work with this on a day to day basis and too much information
accumulates.