What can I use to get pencil lines off of wood? I've tried erasers.

Try magic eraser

Try 409 cleaner. It's a great cleaner.

Murphy's oil soap

I use mineral spirits to take any pencil marks and measurements I write on wood.

mr clean sponges

you will likely have to sand off the pencil marks.

I would lightly sand them out

i would try using a high quality WHITE eraser (Staedtler). This will not leave the usual red residue. Good luck.