I put my plug in a little vial of Rusty Duck Black Off when I pull it at the range and it's sparkly clean by the time I get home. I also use the tape method vs the anti seize so I don't have all the grease to deal with. My omega is also two years old and the swinging breach face shows some wear from the place it touches the primer and I've shot closer to 400 rounds.Post a pic of the discoloration if you can. Black off also does a great job of cleaning out the firing pin mechanism. Tom