I tried some iMacros scripting but that didn't go very well as I couldn't write a script to do the job. Also, I imagine it would take ages to delete everything this way even if I made a good enough script.
Is there a method that actually works?
You can use the graph script which is described perfectly on:
Just for you to know, there to acces your, or other profiles (walls from people call the following:
Then after you list the ids of the comments you can call for each one of those the issuing a POST request to: