Please bear with me here because I'm slightly confused. What exactly is a "soap bag"? I mean, I know it's a knit or crocheted bag that holds a bar of soap, naturally, but is it used in place of a wash cloth or bath pouf? Does it increase the life of the bar of soap? Wouldn't it get all nasty and gross if you didn't take it off the bar of soap and rinse it? Do any of you make them, or use them? I came across some for sale at a church rummage sale a couple days ago and have been pondering them ever since. Thanks for any input.