I clean mine after every time I shoot. I live on a peninsula surrounded by salt water. You’ll see rust in 2-3 days if not cleaned and oiled. I don’t get too aggressive with it. A few passes with a brush and then alternating solvent and dry patches until clean. Usually takes 10-15 patches. I use BoreTech Eliminator, and always use a bore guide.
I also blast out my bore guide with brake cleaner or gun scrubber every so often. That could be your problem.
I also blast out my bore guide with brake cleaner or gun scrubber every so often. That could be your problem.