The gooey, shmear spotting is the plant bug excrement. When scouting, you may not see the insects, but their spotting gives them away.

Tropidosteptes forestierae (Hemiptera: Heteroptera: Miridae: Mirinae): A New Species
of Plant Bug Injuring Ornamental Florida Swampprivet, Forestiera segregata
(Oleaceae), in South Florida.

authors: Thomas J. Henry, Doug L. Caldwell and Susan E. Halbert

Insecta Mundi 0240: 1–10
Published in 2012; see page 7 for pictures.

https://blogs.ifas.ufl.edu/collierco/files/2018/04/Florida-Swampprivet-plant-bug-6-15-12-pub.pdf

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