Yes, honeydew excreted by insect (aphid/scale) would cause that sticky stuff. A 50/50 spray of rubbing alcohol & water (several times over a few days) would probably get rid of the bugs. Then wash the leaves.
And just an FYI, if it interests you, spelling of your plant: Aeonium 'Zwartkop' :D
Colleen E
sradleye
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