Today I cleaned my EGR passages out plus the EGR valve. I figured some might be curious what it looked like dirty before I cleaned it. I have a 2009 with like 112k miles.
Changed the gasket when I was finished. 17146-RB0-004 Gasket, EGR Chamber cover hondaautomotiveparts.com $23.76.
Used this video to help:

 

Very good! Thank you for sharing. What direction do you put the dented side of the gasket??

 

The bolt holes aren't symmetrical, so basically they made it idiot proof to put on. I had the same question myself and after flipping it around a few times confirmed it only goes on one way.
The bigger pain was cleaning up the old gasket with a razor blade. You can reuse the gasket but I wouldn't. Not something that needs changed often, so better just to change it.

 

@SiXiam Good post, sir.


The best part of the video was that he showed the brush. Otherwise, it was a "cleaning" video that didn't show any cleaning.

 

Thanks!
In fairness to them you wouldn't have seen much other than their hand moving a brush. Given it would have blocked the view.
I wish now I took a picture after I finished cleaning, but I really only took the dirty image to show my dad. Later on I thought: oh I better post it here. I knew it was a common thing to clean in other Honda's like the Civic.