People are sharing pictures of scorched face masks, warning of the danger of microwaving them, after viral posts recommended microwaving cloth face coverings in plastic bags for “2 to 3 minutes” to clean them.

Since so many people have tried microwaving their masks, fire departments across the country have been warning people of the dangers.

For example, here is a Facebook post by the Cherry Hill Fire Department

The Centers for Disease Control and Prevention (CDC) recommends that cloth face masks should be "routinely washed" in a washing machine.

Officials in New Jersey made a similar announcement a week ago.

MORE INFO: 7 easy ways to stop touching your face


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