My GF just bought some of this stuff at Wal-Mart on a whim. $2.50 for a pack. It's simply amazing.
You squeeze it into cracks and crevasses and it pulls out all the dirt and dust. So much better than using a detailing brush and then having to vac it up. This stuff get's 100% of the dirt out of the smallest hardest to reach places.
Great around buttons, knobs, air vents, CD players, Shifter boots, cup holders, pocket knives, keyboards, etc.