If this does not work, try a plunger. Since lavatory drains have overflow outlets, it will be necessary to plug these with tape or rags before using a plunger (Fig. 3). After plugging these overflow drains, use the plunger exactly as you would in opening an ordinary sink.
If the wire and plunger treatments do not work, use a sink auger or plumber's snake. This can sometimes be done without removing the sink trap (Fig. 4).
If none of these efforts work, set a pail under the lavatory (see Fig. 5), and remove the trap. Cover the chrome nut with a rag or tape to prevent marring by the wrench.
Loosen the thumb screw on the plumber's snake and move the handle back about 3' (Fig. 6). Insert the snake into the drain pipe, rotate the auger, feed it in, then rotate again. By repeating this process, the snake can be driven deeply into the drain pipe.
