Try pure neem oil such as dyna gro sells.

It should take care of the problem. I would suggest also purchasing an insecticidal soap and mixing the two together. The soap not only kills the bugs on contact, but acts as an emulsifier for the oil so it adheres to plant surfaces better.

The soap kills the soft bodied critters on contact and the neem oil sticks around to take care of anything left munching on the plant.

Neem oil is safe for beneficial bugs as it has to be ingested to work and it's safe for humans as it's modes of action don't affect us (it's used in some organic health care products that are ingested and applied to skin).

Which post are you referring to? Can you paste the link for us?

Someone posted hairy leaves due to giant whitefly. Is that what you're referring to?

It sounds like mealy bugs from your description. I would take a garden hose and try to wash off as many as you can. Force the water under the leaves. Then I would spray with an insecticidal soup. Repeated applications may be necessary but you can definitely get this under control. Citrus can be prone to a variety of insect pest--especially those that have to be overwintered in warm, dry homes. You can dramatically reduce bug problems in citrus by reducing winter temps and increasing humidity.