back windows on 1990 buick, century will not work. How do I fix it?

If the back windows weren`t used very much the armatuer on the motors are dirty ..other than replacing motors while the key is on press down on the window button and slame the door not letting off the button ..if it starts working let it go up and down for awhile and it`ll proably be OK .....yep it works

bg
August 2008