You ever wondered why the trees start foaming in the rain? Well. In warm weather a trees' bark produces oils, at the same time a range of natural salts and alkaloids which are free floating in the air can also land on aforementioned oily bark. Add water in the form of rain and you've all the ingredients for a crude soap. As these ingredients move down the trunk they're agitated by the rough bark creating soap molecules which in turn lead to the bubbly foam. It's very crude, and may not be super effective, but it is soap. A useful nugget of bushcraft knowledge that...maybe.
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