The ReDesign Diva
It's quite simple really. All you have to do is set your machine on either handwash or delicate, use cold water and a special laundry detergent for delicates (woolite, zero, etc.) To dry, you can either line hang it on the length by folding it in 2 over the line or place it in the dryer on the air fluff choice so as not to shrink the cotton.

Sand Dollar
I would wash by itself on a delicate cycle and then hang to dry.