Im not talking about carbon, this looks like copper from the bullet jackets.I've not had any first hand experience with a ported XD, but on my ported Glocks I was able to just wipe them off. I don't think you're going to scrub off the melonite. The front sight should just wipe off, although you may have to stick a q-tip in to get the dot clean.
When i clean mine i just run a patch threw them with cleaner on it. A toothbrush comes in handy to. What ammo are you using wolf or something? I never get bad build up on mine and they come clean with little effort.Im not talking about carbon, this looks like copper from the bullet jackets.
the front sight is just carbon, and is a lot easier. im thinking of coating it with clear nail polish so it doesnt stain the white and cleans off easier.
But im still getting significant deposits on the slide itself. theres gotta be some way to prevent this or at least a method of cleaning better than CLP and a .223 brass bore brush. Im going to have to start shooting with my non-holey barrel and thats no fun