Flynt
Member
Has anybody encountered this? I left Wipe-Out foam bore cleaner in a bore (70's vintage Marlin 1894) for about 2 hours and this is what I got. The can goes on and on about how leaving it in the bore 24 hours or longer won't hurt anything and says, "Wipe-Out cannot cause rust." I've left Wipe-Out over night in plenty of rifles over the years without any problems.