Answer:
You just spray the mould with this wonderful new product called "Curtain Magic Mould Remover" which you can buy online from www.CurtainMagic.co.nz and they ship it anywhere in the world from New Zealand.
It really works!! I was sceptical at first, but now I'm a believer. And best part is there is no scrubbing required. So you can spray it on and leave the bathroom. It worked on my curtains and nettings too.
You can watch the video on their website and the mould disappeared from my thermal curtains exactly as it is shown in their video: http://removehousemould.co.nz/how-to-remove-mould-from-curtains.html