Hey guys, I had my 2012 S60 parked outside for the past month while the snow was melting and I was traveling. I’m driving it today for the first time in a month and notice a weird rattle in my wiper, driver side. Any ideas? https://youtu.be/WdW5w7AtrP4
Hard to tell from your video but your wipers may have taken a set so the blade stutters on the return swipe. With the wipers in the service position, lift the blade for a moment and set it back on the glass. Then look to see if the blade rubber is perpendicular to the glass surface. You can twist the flat part of the arm to correct the set as shown below. https://www.youtube.com/watch?v=Fjnk1pgP1gY
Also try cleaning the blades with alcohol and clean the glass surface where the blades rest in the off position with glass cleaner.