Block overflow holes with a wet cloth to ensure the pressure goes directly to the clog. Pump vigorously up and down 5–10 times. :
Often enough to melt away grease or soap scum in kitchen sinks. Caution: Never use boiling water on PVC pipes, as the extreme heat can warp the plastic or damage gaskets. how to unclog pipes
Remember the volcano experiment from grade school? That chemical reaction can help break down gunk. Block overflow holes with a wet cloth to