To make sure your shammy towel stays at its ultra-absorbent best, wash in a conventional front-load washing machine with a non-detergent soap like Granger's Performance Wash. Detergents can damage the treatment that keeps sand, odor, and pet hair from sticking to your favorite towel.
To dry, line dry or tumble dry on low. (Dryer temperatures can vary so keep a close eye on dry time and temperature!)
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