It's the special cleaning instructions for KotWS that is really arcane to me.
I agree. It is arcane to me too.
I personally would not invest too much effort into it. I'd probably would do like Psymon did: install it, play it and remove it. If it does no work properly or does not cooperate while being installed, I'd get rid of it right away and look to add some other mod. There are so many nice mods out there that work that I would never invest much time and effort to make that particular one to work, especially if the author has vanished and one is left to one's own devices.
As a general remark it should be stressed that normally, a mod will work even if it is not cleaned. The simplistic assumption / perception that a mod is unplayable because it is "unclean" as per the Guide is definitely not correct! Unclean does not equivalent broken! :nono:
Usually it is still worth a try and see if it works in your installation of the game.