Does the tip of the blaster have to be thisclose to what needs to be moved, in order for this thing to work?Tried blasting my keyboard, and it didn't move a single pet hair from the keys. To get this one stray pet hair, I had to pull out the sticky tape! What the deuce?I'm returning this as "Different from description" if I can't get this thing o move some dust and pet hair, soon! Any advice?