Combine hyperopia with a dead battery in the borelight and you get my buddy who has cleaned his BT99 for five years with a WD-40 soaked patch. He says the bore "looks" clean. I prefer it to be clean; that means dissolving/mechanically removing the plastic as well as a couple of stray flakes of powder and a smudge of smoke. ITM'sO, as time goes by, bad things happen under that plastic.

jack