Fig Tree Bonsai

My home was just pressure washed.i woke up this morning and found all my figs with a black material all over them. The underside of the leaves look fine. Could this be the overspray from the pressure washer and the chemical they used ?

Caveat: i do not have any fig trees.
Observation: the smaller new leaves do not have the black area’s, if it was residue from overspray or chemical i would expect them to show some sign as well!