-I simply spray the tops of them with my colloidal silver before each use. why not pull those stones out of your bathroom cupboard and give this method a try.
I guess because of the alum / aluminium content Rowena
-I simply spray the tops of them with my colloidal silver before each use. why not pull those stones out of your bathroom cupboard and give this method a try.
I guess because of the alum / aluminium content Rowena