This white-wash is typical of birds. (Photo by Stephen Vantassel)
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Grackle dropping (freshly deposited).
Note how the white portion of the dropping is in liquid form. Grackles can roost in trees in large numbers causing many car owners great distress.
Reptile
Snakes, particularly rodent eating snakes deposit liquid droppings with a white cap. Rattlesnakes and Black rat snake droppings will appear identical. Short of laboratory testing it is rarely possible to distinguish them from each other.
Lizard Dropping (Typical)
Note the skinny brown portion is embedded with insect parts and attached to an urea pellet (white cap). Photo courtesy of Steve Evans.