I found that bore butter and muzzleloader safe products don't do well cleaning or preventing rust. I clean my muzzleloader the same way I clean my rifles. I use Butches Bore Shine and after cleanup, follow up with breakfree (CLP) for storage (leaving the breath plug out). Before I shoot, I spray the breach plug with carb cleaner and run a dry patch through the bore, then fire a primer. I'v never had a problem loading the muzzleloader the night before opening day and it firing it 3 or 4 weeks later.
