I've evolved to using a #2 mechanical pencil. No sharpening. Never had an issue having it wash out. Sorry I can't help with the chacoliner. I have them but was not happy with the markings so used something (?) else and never looked back.

I had the same experience with the blue. Even after washing it it still showed some marks. I did the blue on yellow flannel. Won't do that again! :)

You can buy a "fabric eraser". It works great on taking off
lead pencil marks. Might have to do some looking to find who carries them. So many shops are not carrying those or
stencils, I assume because there are not that many hand
qulter's anymore.

Yikes haven't used mine.
Maybe won't!