Posted: 26/08/2013 at 06:00
The most important thing is to make sure that they are completely ripe, when they will have a dull beige/greyish colour and the vine is going yellow and dry. Do not let them get catch any frost, cover them with newspaper or similar if frosts are due and they are not quite ripe. Leave about an inch of stem when cutting off the vine.
I have never done anything apart from wiping any soil off with a damp cloth and then letting them dry completely. I still have one from last year that is still fine, will have to use it soon though!