Mandevilla or Dipladenia;
pink, red, white, or yellow flowering sub-tropical & tropical vines of the Apocynaceae or Periwinkle families;
tend to attract Mealybugs & Scales.
Horticultural oils like:
Cotton seed oil, Soy bean oil, Sunspray (R), Scalecide (R), Volck(R) , ...;
can be fairly safely used;
Horticultural oils work mostly by asphyxiating many insects & larvae.