I've been using the olay in-shower lotion when I swim, and it's kept my skin from drying out so far. You wash with regular soap, then put the lotion on, then rinse.

Before that I was using an extra-dry skin body wash from St. Ives that worked well, too. The lotion seems to be defcon 2 to the body wash defcon 3... I'm not sure what defcon 1 is yet

PS: I always shower RIGHT after I get out of the pool. I know it takes longer, but the longer that chlorine seeps into my pores, the worse my skin gets.