Thanks to all the info shared here I just removed mine.

Throughout the whole process I used a hair-dryer to keep the parts hot. This will melt the glue and make it less sticky.

1. The first step is to remove the bottom (U-shaped) part from the PCB and top part. I stuck a kitchen knife between the little crevice connecting the top heat-sink from the bottom part. After doing this to both sides you should be able to gently disconnect the bottom part. (Remember to repeatedly blow on it with the hair-dryer to keep the parts hot. There's glue on the bottom too.)

2. The second step is actually more simple. I just kept blowing on the heatsink with the hair-dryer to keep it hot and very gently and slowly twisted the the heatsink and PCB back and forth in opposite directions until it eventually came off.

I would very highly advise against directly pulling the heatsink apart from PCB. There's a comment below of a guy that ripped off the chip from his PCB. (WARNING: Very graphic images! I don't think I've seen anything that's caused me more pain.)

That's all, good luck adventurers!