I expect that it will eventually come out over time however as the cable moves through the housing it builds up a very small static charge and the graphite attracts and clings pretty well to the cable. I expect to be changing out the cables long before the graphite is gone. As for the messiness, yes def some really messy stuff, it gets all over everything and after I was done running the cables and getting them all set, it took some clean up to get it all.