CKEditor how to stop partial (font) styles from displaying in markup?

Question

I believe we are currently using version 4.17 (not sure why not on 5?...anyways)

Anyways.. when copying and pasting from a word document, we normally get a huge mess of SPAN tags repeated over and over. (In version 4.1 I dont recall seeing this.. in v4.17 it is everywhere).

After some searching. I added in the config parameter to remove ALL font style form word paste.

config.pasteFromWordRemoveFontStyles = true;

At first glance.. this seemed to work.. but then I noticed tings left over like:

<span calibri=""><span arial="">blah blah blah</span></span>

1.) Wouldnt this be part of the 'font' styles? (family) 2.) These arent even legit tags (so how is this happening?) 3.) What is the fix for this?

Also, after using:

config.pasteFromWordRemoveFontStyles = true;

How can I still allow 'color' styles to come through? (not the main puporse, but curious if you can 'extraAllowedContent' things after the 'pasteFromWordRemoveFontStyles' action?

Updated: Wow.. (crickets? interesting)

To recap:

After adding this:

 config.pasteFromWordRemoveFontStyles = true;

I am still getting this:

<span calibri=""><span arial="">blah blah blah</span></span>

In other random word docs pasting from.. I am seeing things like this: (which I have no clue how to address? not a class or style or attribute)

<!--[if--><!--[endif]-->&nbsp;<!--![endif]--><!--![if-->

Why? And how do I fix this?

thanks