Bathroom sink suddenly clogged. Hasn't happen in many years. Nothing down the pipe but soap and toothpaste. I went in with a 1/4" drain snake but no matter how much I try I can only get down about 15" (measuring from the wall). The pipe is 2" iron that might be as old as seventy-five. Could it have rusted closed? Seems unlikely. Thank you all and thanks above all to Terry.