Funny... mine came off too. I really go through the wiper fluid (especially since the headlights get swept if they're on at the time). I reseated it and it's been fine ever since. I'm glad it was there too... I refilled the reservoir with an older bottle of washer fluid and I guess some settled at the bottom because the screen collected a bunch of small clumps of undissolved cleaner. Could have clogged my feeder hose I'll bet. I should have bought new fluid, but I had a jug of it left over from when I had my Passat.