Related Clues:

• Wipe off, as a slate
• Finish off
• Do blackboard duty
• Demagnetize, as a tape
• Get the lead out
• Get the lead out
• Wipe away
• Wipe the slate clean?
• Wipe
• Scrape off
• Invert and use a pencil
• Tend to a spill
• Clear off
• Do some character assassination?
• Remove all traces of