Around instructables, I have seen a lot of comment chains that were on orange boards that were deleted but they still remained because they were deleted in the wrong way. This instructable will teach you how to delete the comment chains the right way.
Step 1: Find a chain that you can delete
Now this can be a comment chain on your orange board with no deleted comments or a comment chain that is only made of your comments without any other peoples comments later down on the chain. If it is not either of these chains, then it will not work.
Step 2: Identify the parts
Now you need to Identify the parts of the chain, labeled in the image below
Step 3: Start deleting
Now start deleting by going to the right most layer of one part of a chain and delete those comments.
Step 4: Continue deleting
Now delete the comments in columns from right to left. If you do it backwards, it will not work. Stop when you hit a point where there are multiple replies to one comment.
Step 5: If there are multiple replies to one comment
If there are multiple replies to one comment then delete all of the replies staring from the bottom up. Then continue on with step 4 again.
Step 6: Keep on going
Just keep on repeating steps 4 and 5 until the job is done.
Step 7: Success
Congratulations, you have correctly cleaned the comment chain.