the white stuff could be "white fly". ' p* |) ]) X6 ?5 [+ `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.9 S6 U( A# a) A0 @' i' |& ~; ?
Hibiscus is a typical plant, show helps a lot.