Posted: Thu Jul 31, 2008 12:01 pm
If the shell is healthy and doesn't have algae on it, there's really no need to clean it. Some people do, however, periodically gently "clean" the shell (nothing special is needed, however, beyond a soft cloth or brush and some water)---it can give one a chance to inspect the shell more closely for any abnormalities in it.
If your friends are using a special product and the shell is healthy, it sounds like they're wasting their money.
"You become responsible, forever, for what you have tamed." -Antoine de Saint Exupery-