Unfortunately almost everything has a downside, and with Hoya mirabilis it is the nectar.  It drips constantly and copiously on everything creating a huge mess.  It is not a thick syrup like the nectar from H. kerrii, but watery and sweet.  It creates sooty mold when left on the leaves and anything else it touches.  This is a plant that begs to be kept outside!  The bottom photo shows that I was forced to cut off all of the flowers after its photo shoot:(