Related Clues:

• Scrub, NASA-style
• Prepare for an operation
• Cancel, as a space flight
• Call off, in a way
• Bench sitter
• Cancel, as a rocket launch
• Call off, as a launch
• Wash hard
• Scrub, as a mission
• Clean well
• Do some cleansing
• Clean thoroughly
• Prepare to operate
• Clean diligently
• Scrub a mission, e.g.