To be fair, it's a block of salt. Not only would microbes have a hard time surviving on it, but you can just run water over it and the top layer will dissolve away.
General rules:
Exceptions may be made at the discretion of the mods.
To be fair, it's a block of salt. Not only would microbes have a hard time surviving on it, but you can just run water over it and the top layer will dissolve away.