Are you talking about the moveable grills that direct airflow? I just rotate mine down as far they go, grab them from the top, and keep pulling down and out. Or maybe it's the reverse...rotate them up, grab the bottom, and pull up and out. I can't remember which, but I've removed them this way several times to clean out drink spills and such. The assemblies pop right out, and then snap back in. The ductwork behind the dash is a different story.
try getting skinny flatheads down to the middle of each side and press them in then pull out simultaneously