Unblock Me Times Three

Surely that is an impossible thing to do How to go about it I'm sorry I haven't a clue Time to call an expert as I ponder and think There must be a way to unblock my sink That can't be done I'm willing to wage a bet Laid down a challenge the rules have been set Surely that is an impossible thing to do How do I wonder attempt to unblock my loo Things comes in threes so I will say it again This time I need help unblocking my drain I fear that I will become a laughing stock So many things needed to help unblock