the white stuff could be "white fly".' [1 W* c/ R' D6 ?" F0 n7 U2 y: m
I 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.6 A0 l; u, E6 i" o! K0 Q# v4 S" f
Hibiscus is a typical plant, show helps a lot.