After I use iosso bore cleaner on a nylon bore brush on my bore cleaning rod, even after I clean of the remaining bore cleaning paste off with a rag, there remains considerable gunk between bristle rows on the bore brush. I have tried spraying the gunked bore brush with Blaster penetrating fluid and it gets some off but there's still a bunch of gunk left on the brush between bristle rows. Could just buy more nylon bore brushes or just set the dirty/gunked bore brush aside for use next time. However, maybe you all know how to get the gunk out. Thoughts?