Has anyone had any success in eliminating magnolia scale

from their flowering magnolia trees/bushes? Mine are about 15-20 ft and those bugs are dripping that honeydew all over the lower leaves that attract bees and wasps at around my front door. Sooty black mold will then feast on it and kill the leaves as well since they won't be able to perform photosynthesis.

I don't want to kill pollinators or other plantings: yew, vinca ground cover, holly, sand cherries or red cane varigated-leaf dogwoods, but hate the thought of those pests sucking all the juice out of my magnolias all summer long thus weakening the whole tree during summer droughts and killing the young branches that flower next spring. Are any systemic pesticides very effective?

I've also heard one could use horticultural oils, possibly Neem oil sprays, to smother the critters if it's sprayed at a very specific time, when "crawlers" emerge, mate, and lay eggs, or dormant oils later, late fall, but these magnolias are very tall.

I can't afford the services of an arborist - HELP!