I heard Jim Lee (THE top comic artist of the last 20 years) speak long ago about non-photocopy blue pencils. You sketch in pencil, then pick out the best lines in non-photo blue and erase, only the blue lines will remain, allowing you to have a nice wire frame for your drawing that can easily be removed upon scanning. These days, you can even do it with a mechanical pencil: Like this Pentel Sharp 205 with 0.5mm non-photo blue lead.
I spent years using the trusty Pentel Sharp P207, but a couple of years ago, my favorite mechanical pencil became the Pentel GraphGear 800. The 800 has everything the P207 has, plus a more solidly mounted eraser, a raised grip where your fingers touch, and a sturdy, all-metal, tip that can withstand almost anything. I’ve used all of my GraphGear 800s until the names have rubbed off. You cannot go wrong with this pencil, I’ve spent so much time with the GraphGear 800 that we’re legally married in Kentucky.