OK, I was able to delete the files using Linux commands. Not sure why I wasn't able to do it using FTP.
For others looking for the solution, here's how I did it...
Once you figure out how to SSH to your Wowza instance, you'll need to change directories (cd) to the sharedobjects directory. For me it was:
The "gotcha" is that when you have so many .rso files, you can't just delete them all in one command. Instead you have to execute the following command:
You have to do it that way because (from my understanding) the rm command alone has a limit on the number if files it can delete at one time, so instead you have to pass each file name in one by one to the rm command. So first you run the find command to match all .rso files and you then pass (aka pipe | ) each file name into the rm command one by one (although it all happens automatically behind the scenes).
find . -name '*.rso' | xargs rm
It takes a second, but it does the trick.
If I screwed up any linux terminology or explanations, please feel free to correct me! All I know is that what I did worked!