Step 5 · Clean the P-Trap Thoroughly
Take the detached P-trap to a utility sink or use a garden hose outside for cleaning. Use a flexible bottle brush to scrub the interior surfaces thoroughly. A small amount of dish soap and warm water will help dissolve any grease or soap residue. Make sure to clean inside all curves and openings. While you're at it, inspect the rubber or plastic slip joint washers for any cracks or signs of deterioration. If they are damaged, they should be replaced.