The women sell the shampoo in local markets, or to tourists.

But they also use the device for more exotic purposes.

"My personal opinion is that the best margaritas in the world come off a bicycle blender," Watkiss says.

....

The pedal powered machines include one that stips the kernels off maize cobs and grinds them into meal — a task often previously done with two stones or a hand-turned mill.

"This makes the difference between spending weeks on getting your corn ground, and a day or two," Watkiss says.