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					Originally Posted by Tex2002ans    
There's also:
Convert books > Convert individually > Look & Feel > Styling 
At the very bottom, there's a "Filter Style Information" section with checkboxes for:
  Fonts Margins Padding Floats Colors
 
This would remove all that cruft from the CSS files on conversion as well.
 
Might be helpful for condensing down even more of those "unique" CSS classes.
 
I only noticed those options a few weeks ago though, so I haven't done in-depth testing.
 
Might also help convert those hundreds of styles down to a few dozen. | 
	
 Many thanks for that too!