Morning all, the kettle seams to boil a lot quicker after its defurrring, I tried out a little tip I was told about and it works! Don't empty the defurring liquid down the sink, instead empty it into a washing up bowl and add an equivalent amount of cold water, place any glassware that has become cloudy in the bowl for about 10 minutes and then allow to drain (do not use a cloth). You will find the glassware comes up crystal clear.