
to NGA
Insecticidal soap will clear up scale .....(and will "break through" their wax like homes)
it is important to spray under leaves and along stems ....let spray dry, then wash off, as it is no longer effective (and may cause harm to leaves on *hot* days) ...
more than one application may be needed
Insecticidal soap ....either pre-mixed from big box stores ...or ...make your own ....many recipes online