Hips

I'm experimenting with HIPS as raft/support. I got a roll of HIPS, but I couldn't get chemical-grade d-limonene yet (no local stores have it and Amazon insists on shipping it to me via UPS ground from the other coast, so it'll be a while till it gets here.)
In the mean time, I got a bottle of orange oil in an agricultural store. Per Wikipedia, it's supposed to be >90% d-limonene anyway. Results are somewhat underwhelming. Instead of dissolving HIPS outright, soaking the part in orange oil turns it into goo with the consistency of toothpaste, which can be hard to get out of all the nooks and crannies. I made this one overnight http://www.thingiverse.com/thing:675422 with full internal HIPS support, and, after 4 hours in orange oil and 3 rounds with a water hose, I still didn't get all the crap out from the inside.
Is this the expected outcome, and are there any tips/tricks for getting partially dissolved HIPS out?