CLP can be left in the barrel overnight, it is even recommended. the next day repeat to get the stuff loosened overnight. Cleans, Lubricates & Preserves.
M-Pro 7 Bore Gel for cleaning the barrel and Break Free CLP to protect the metal from corrosion. The main reason is that M-Pro 7 not only works very well but it smells good enough to that you can clean in your kitchen without getting in trouble with SWMBO . I store it in the fridge to keep it extra thick.