The crustiness generally forms when the salt melts in response to humidity levels or exposure to moisture. This may occur if a few drops of water were left on the salt block after you last used them. It may also be a result of not being stored correctly. In order to prevent the salt from melting, be sure to always store within sealable plastic bags. In order to repair the damage, simply use a dry kitchen towel to scrub the crusty bits off. Afterwards, heat your salt block as usual.
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