>> A green Scotch Brite pad and water removes pencil very quickly
Thanks! I just bought some pink rubber erasers from Staples, but will try it your way.
It might be a BAD idea to clean the slats with Comet cleanser: I just pulled some out of the soil, and the below-ground parts seem stained. Maybe if the surface had no micro-cratches, they would stay cleaner.
On the other hand, how clean do the below-ground parts NEED to be?