Remove most of the color, then use an electric eraser or hand held eraser, like those pencil shaped ones that you push the eraser out of.
(Remove most of the color; use; an electric eraser or hand held eraser; T:then) (electric eraser or hand; held; eraser) (those pencil; shaped; ones that you push the eraser out of) (you; push; the eraser; out of)
Remove most of the color electric eraser or hand those pencil you
use held shaped push
an electric eraser or hand held eraser T:then
eraser
ones that you push the eraser out of
the eraser out of