Everyday. The old traditional blackboard gets chalk dust build up on it as it is used.
Blackboard
A blackboard seems to fit.
A blackboard
Blackboard
Blackboard
A blackboard.
A blackboard seems to fit.
Go to google and type in your state and blackboard and it should come up.
I donot know
A chalkboard ~_~
You should make sure that its in a clean place but you should clean it every few days
You should clean it everyday that you use it.