Built in the pre-button era these washing stones will get your clothes clean for sure. I say pre-button era because with a few smacks of your shirt on this rock you are likely bound to loose a button or two. But it takes a skilled washer to wash your clothes on these rough surfaces and not tear them.
In many smaller villages and towns in India you'll see men and women washing their clothes by rivers and in ponds. And the clothes come out very clean! Most of these clothes are then left to dry on bushes, along the banks of the river and pretty much anywhere that it won't get stepped on.
