the white stuff could be "white fly".# w2 G' {5 N0 \; f( U1 [
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. - n" x! @& C+ a% Y0 D# t- S0 ]3 k4 AHibiscus is a typical plant, show helps a lot.