Possible Clues:

• Managed to go up river to remove insects
• EU doles willy-nilly: treat for parasites!
• Poor soul drowning in river to get rid of nits
• Nitpick, literally
• Remove some pests, escorted over river
• Get rid of lice
• To remove bugs from half of code, student replaces third of memory in peripheral
• Get the bugs out of
• Nit pick?
• Perhaps stop scratching sole due for mending