Once you capture your session in screenlog.n , you can cat the file to the terminal and then use screen's hardcopy command to dump the cat's output to a file . The result will provide you with clean output that does not have any escape sequences.
The only 'gotcha' seems to be to make sure that hardcopy captures eveyrthing in the scrollback buffer and that the scrollback buffer contains only what you want to capture.
1. $ screen
2. $ cd /path/to/screenlog.n directory/
3. $ wc -l screenlog.n
4. $ screen -X scrollback 245 # 245 is the number of lines found from your wc command + 5
5. $ cat screenlog.n
6. $ screen -X hardcopy -h screenlog.n.cleaned
Note that -h ensures that you capture the entire scrollback history and not just whats in immediate view
The screenlog.n.cleaned file will now contain a hardcopy of the cat output and won't include any escape sequences