I use Ballistol. With my 22 rifles I just run the snake through twice. Sometimes I spray a little Ballistol on it.

With my SD9 that gets a lot dirtier? I spray the bore with Ballistol and let it soak for awhile. Then I run the snake through a couple of times.

Note: boresnakes are washable. Put it in a pillowcase and throw it in the washer when it gets dirty.