the white stuff could be "white fly". 9 @( w+ r! P! Q \9 o+ y1 bI had the same problem before. It because your plant is too wet. I showed the leaves twice a day for a whole week, then the white filies were all gone.+ p& M5 G8 P; j6 g2 Z0 H% p- s z
Hibiscus is a typical plant, show helps a lot.