How to remove crayon from a blackboard

[FinallyFreeFromItAll]

How can I remove crayon scribbles from a blackboard?

wd40?

One of those white magic eraser blocks?

Jif, then blackboard paint. £5 in Wilko.

Kitchen roll over the wax and then a hot iron.

Try a good scrub with a baby wipe. Works on ours

Aggie and Whatsername used to recommend rubbing it with bread for crayon on walls.
Personally, I find babywipes remove a multitude of sins.