Possible Clues:

• Washday challenge
• Laundry problem caused by a leaky pen
• Leaky pen problem
• Something for the old journalist perhaps Stalin left out? It's the sort of stuff that blots one's copybook!
• Laundry challenge
• Dry cleaner's challenge
• Blotch caused by a leaky pen
• Sink a tin and make a blot
• Tough job for a dry cleaner