Over this past year I've changed injectors several times this year due to idle haze. The first couple of times I would always get 1 or 2 injectors that would seep or leak. I was in walmart one day and was looking at gun stuff and I picked up some 12 gauge bore mops. I would use the metal brush that I got cummins first and then go back and use a clean bore mop to clean the bore. The bore mops would leave a little lint but was able to get it out with an air compressor. That stopped the leaks by 95%. The 12 gauge size fit perfect.

Mike