I think Howa recommends cleaning the barrel as normal and then put a patch of windex down the bore. I use it on my 223 all the time now. Something about all cleaning solvents containing some form of oil or so. When you fire a round down the barrel the oil is heated and turns to carbon in the barrel. Windex removes all oil residue so it is not a issue. I have been doing it on my 223 for 2 years now and after 100 rounds it takes 3 patches to clean it to new condition. Sounds far fetched,but,,Hey it seems to work.
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