@peterjones
Yep, now that I understand the syntax of the Esc-sequence it was easy for me to remove them using the replace function of Notepad++. The ESC was shown as square in the Replace-dialog but worked fine.
To me it was not important to see the formatting just the content (and I wanted to be sure that I did not remove content), luckily there were just 2 or 3 variants of Escape sequences used.
And yeah it’s funny how that sometimes related topics become active at the same time.