I've been using the RD black off for a year or so and yes it works quite well. 2 to 4 wet patches, both sides, and a few dry patches and patches come out clean. I then run an alcohol patch or two to dry out any liquid and then verify with a patch of Ballistol, if it's clean I dry swab then use BC Sheath in the bore,finish the outside and and BP/nipple and I'm done.