Maybe you have read the Shirts of Bamboo washing instructions…

Dry cleaning? Leave that for the wool, silk, and cashmere! Save your money and be kinder to the environment by simply showing your bamboo clothing a little love, and it will outlast any cotton clothing. Wash on a gentle setting (we use cold water.) Skip the chlorine bleach and liquid fabric softener, which can damage bamboo fibers. Line dry or tumble dry on low setting, using dryer sheets if you like. Wrinkles seem to fall right out of bamboo, making your iron obsolete,(and making bamboo perfect for travel), but if you insist, iron on a low setting.

As illustrated by the photo below — washing your bamboo shirts in the river using sharp pointy rocks is just a bad idea (and it will void your warranty).

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So — just don’t do it.