In response to the first post, if the glass is original and ancient it will shine far more than modern glass, todays modern finish is sort of matt...not as smooth as the old fashioned hand rolled glass, and I think that it makes no difference if it is cleaned with WFP or trad, that stuff comes up fantastic either way.
So for me it isn't the method that makes the biggest difference, it is the type of glass and the way it is manufactured.
Ian