While researching native shrubs to put in my garden for bird habitat, I read that some birds will take advantage of bushes to clean themselves by rubbing themselves against a wet leaf after rainfall (emphasis below is mine).
Water: Birds that sip nectar from the flowers on shrubs will enjoy the liquid refreshment, and larger shrub leaves will collect small amounts of water that different birds may sip. Birds may even rub against damp leaves for a quick bath.
--The Spruce, "Shrubs for Birds"
I've been unable to find any reference to this from further search on the internet, though - the only cleaning strategies I've found written about are puddle bathing, dust bathing, and anting. Is this strategy of cleaning with wet leaves something that actually happens in nature, or just a product of a gardening website's imagination? Is there another process that could be misinterpreted by an observer here?
If this is real, I would love to read more about it, or even find a picture or video of the behavior.