the white stuff could be "white fly"." O( Y" ~) S/ X' e/ x5 A% I3 D ]
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. 5 [ H/ i( M* S( n I+ X. m# _Hibiscus is a typical plant, show helps a lot.