If you look at their website, they say it cleans itself (squeegees the water) every time you open it up (coil it back into the tube).
From their site...
4 Reasons to upgrade your shower curtain to a SHUB II screen:
The SHUB II screen's innovative wiper system removes water and soap.
The flexible polyester screen is rolled across to create a perfect seal, which means no more annoying puddles!
No more slimy or cold shower curtains to get in the way.
The SHUB II screen is a clean and attractive solution for your shower or tub.
3 Reasons why the SHUB II screen is ideal to add to your existing bath:
The SHUB II screen provides maximum access into and out of the bathing area.
It can be fitted easily to most existing showers and baths - also perfect for narrow openings!
Installation is fast and easy!
Safe and durable
Mold and Mildew free, easy to clean
Screens come in 3 different options and 3 different frame finishes
5-year guarantee on both the frame and screen
Custom sizes are available
Replacement screens available