Stopped drain in sink or bathtub? Get out the plunger. For best results, block the overflow and second drain outlets, and with two or three inches of water in the basin or tub, use steady, forceful downward strokes to clear the clog. If this doesn’t work, try a piece of wire through the clean-out plug, or snake through with a hand or power auger. Disassemble the traps, insert the auger, and clear out any blockages.