I dip it each time I run the mop back and forth.
I also take a rag and make sure I removed all the DBC from outside the barrel (i.e. near the muzzle). I didn't do that once and a bit of DBC hardened there and it was difficult to get it off.
I would like to see Mule Deer weigh in on this since he developed the original instructions. I've applied DBC both ways: dipping the mop each time I run it through the bore and dipping the mop only once at the beginning. Seems to work regardless, but I thought I had a little better results just dipping the mop once.
