the white stuff could be "white fly". 6 P8 t3 o6 X0 a5 h+ g+ gI 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.$ H( g% x: d a8 b4 W2 @
Hibiscus is a typical plant, show helps a lot.