1989 Mustang LX Wipers making horrible noise?

Hey all. I was wondering if anyone has ever had their windshield wipers make a horrible almost screeching sound. They move smooth and at the speed selected with no problem but there is a weird almost wheeeewheeewheee sound that sounds just short of a metallic screeching sound. It's godawful loud and can't be right. Just wondering if anyone else has had this and if it's a common problem with an easy fix or if i need to start digging into it. thanks for the help yall.