Since I've watched people struggle with sand dollars for years I figured I'd post my tried and true method.
Keep them in salt water until you get home. This cuts down on the stink. Throw them in a fire ant hill and if necessary stir it up a little. Those little boogers will strip the shell clean. Then after about 2-3 days set the remainder in the sun.
I've watched so many people just dump bleach on the poor guys. Not only does this not work as effectively, it simply bleaches the guts inside without removing them. Nothing like the stench of rot and bleach. It also diminishes the shell and makes it more fragile.
If you are on a short vacation and simply must have it clean and white before packing and leaving then you have two options:
1.) Stay longer
2.) Buy some at a shell warehouse in PCB.
Keep them in salt water until you get home. This cuts down on the stink. Throw them in a fire ant hill and if necessary stir it up a little. Those little boogers will strip the shell clean. Then after about 2-3 days set the remainder in the sun.
I've watched so many people just dump bleach on the poor guys. Not only does this not work as effectively, it simply bleaches the guts inside without removing them. Nothing like the stench of rot and bleach. It also diminishes the shell and makes it more fragile.
If you are on a short vacation and simply must have it clean and white before packing and leaving then you have two options:
1.) Stay longer
2.) Buy some at a shell warehouse in PCB.