How to remove xmlns attribute from XDocument?

In my C# codebase, I have an XDocument of the form:

<A>
 <B>
   <C xmlns='blabla' yz='blablaaa'> Hi </C>
   <D xmlns='blabla' yz='blablaaa'> How </D>
   <E xmlns='blabla' yz='blablaaa'> Are </E>
   <F xmlns='blabla' yz='blablaaa'> You </F>
 </B>
 <B>
   <C xmlns='blabla' yz='blablaaa'> I </C>
   <D xmlns='blabla' yz='blablaaa'> am</D>
   <E xmlns='blabla' yz='blablaaa'> fine</E>
    <F xmlns='blabla' yz='blablaaa'> thanks</F>
 </B>

Using Linq-to-XML or otherwise, I wanted to remove the xmlns for all the elements contained by element B.

Using the methodology given here: How to Remove specific attributes in XMLDocument?, I was able to remove all attributes except xmlns

What is the best way to remove 'xmlns' attribute from XDocument?