Kitchen Sink Clogged Past P Trap: How to Fix Step 1: Baking Soda and White Vinegar. These common pantry items double as superstars of the DIY world. ... Step 2: Follow Up with Hot Water. Next, run hot (not boiling) water and see if you've conquered that clog. ... Step 3: Plunge the Sink. ... Step 4: Unscrew and Clean the Sink's P-Trap. Nov 2, 2021