The answer is that it can be stowed wet or dry.
The curtain material is impregnated with acrylic to stop mould growing in the curtain material but mold can still grow on the surface. After a number weeks or months you might start to see the odd small spot of mildew appearing. The curtain is designed to be used in conjunction with the recommended cleaner, Dettol Mould & Midlew Spray which will erradicate the spots and treat the curtain at the same time. The curtain needs a quick spray once or twice a month as shown in the video on the following page: http://www.bathroommarquee.co.uk/out-vid3.php
I have found that the dryer you put the shower curtain away the longer you go between sprays - the only downside is that it is marginally more difficult to stow when dry (this is not really an issue once you are used to the process).
