Hoya sulawesiana like many of the Acanthostemma Section of Hoyas is an extremely heavy nectar dripper. Three of these that come to mind really quickly are Hoya sulawesiana, H. sp. MT-02, and H. sp. Sulawesi #1. These Hoyas drip nectar in such large quantities as to make them poor specimens to flower indoors. I have taken to either cutting off their flowers or sealing the entire peduncle with blooms inside of a closed Ziplock plastic bag.