If your running windows on your laptop you can delete them just like any other file or you might choose to make a save dir under your current file area and just move all the saved logs into it so you can start fresh. If your not using windows and only dos you can do the same using mkdir and the move command
Not that I've found. I've just opened the file and resaved and in the process retyped the coment. Good idea to have a backup while doing this, just in case.