How can I fix mywiper blades that are not parking correctly?

My wiper blades park anywhere on the screen - they do not return to the base of the screen - what can be wrong - how can I fix it ?

Thanks for all the help.

Paul,
Paul Madden, March 2006


done
If its a GM car the PARK neutral switch has gone bad
you didn`t mention what year or make car

bg, March 2006