Puffy-eyed protesters fled, hacking for air, into side alleys to rinse out their eyes with water and Coca-Cola, which word had was an effective balm for tear gas.

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Then gargle afterward to rinse out the soap taste.

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Rinse out the first pot and fill it again.

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And arid conditions, especially during the summer, leave the area without much rainfall to rinse the muck out of the air.

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"We effectively use it to rinse our mouth three times and then spit out, " explained Daniel Limonadi, the Curiosity surface sampling phase lead at the US space agency's Jet Propulsion Laboratory (JPL).

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Whenever Nance tells friends to use a saline rinse, they'll usually say "I can not believe how much stuff came out of my nose, " she said.

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