|This is the way the cookie crumbles.|
STOP. Do NOT blow them off.
Your breath has tiny moisture particles (remember, if you are reading this, you can "fog a mirror".) This can be disastrous, especially if you are using water soluble color pencils (unless you are going for some pointillism effect.)
STOP. Do NOT wipe them off with your arm or sleeve.
The slight downward pressure may (Murphy says "WILL") be enough to make them leave little colored comet trail streaks.
You need one of these: Drafter's Brush
|Tool from back when drafters had to touch things other than their computer.|
Simple, elegant, and designed for the exact purpose of removing pencil crumbles and eraser stubble. Draftsmen figured this out decades ago. Horsehair drafting brushes are cheap and easy to find now that you know what to look for. Find them in the art department of stores like Hobby Lobby or grab one here on Amazon with about 3 clicks. They come in different sizes, and unless you are a power-crumbler, the smallest size 10" (pictured) is all the brush you need.
Happy coloring, and may your white areas stay ever white.