Viewing post #1800940 by tarev

Seedhunter said:There are a few black specks. The white substance on top of the leaves has gotten worse and I've noticed it on another tree.

If it is staying outdoors now, try to do like a gently power wash all over your plant, see if it washes it out.
Next approach, use a diluted liquid soap with some alcohol and spray mist all over the plant. But do it while plant is in shade, not when sun is hitting it. Observe if it recovers after a few days. I try to do the simplest approach first.