Are these fuzzy things pale in color? They could be aphids. The buds and blooms are where ahpids like to hang out. I spray soapy water on my infected hibiscus every day and this helps. If you can, on a warm sunny day, take the plants outside and hose it down. I lay my plants on their sides and spray away. Gets the bugs off and cleans the dust off the plants.
This really helps keep the little buggers at bay and the plants appreiciate the cleaning.
Barb