What specialized product allows astronauts to wash hair without using rinse water on the ISS?
Answer
No-rinse shampoo
To adhere to strict water conservation rules, hair washing utilizes a specific formulation called no-rinse shampoo. This product was originally designed for use in hospital settings for patients who could not easily access or use traditional rinsing facilities. The procedure is straightforward: the shampoo is applied directly, massaged vigorously into the scalp to cleanse, and then the residue and moisture are completely removed solely by toweling it dry. This technique effectively eliminates the necessity for any running water dedicated solely to rinsing hair.
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