If you are as annoyed with the OEM rear window wiper as we you may want to check our solution in the general forum. An articulated 20" wiper blade is a huge improvement on the OEM 6" blade. Articulated arm keeps the blade horizontal so it fits under the spoiler. No drilling on the lid and the change easily reverts back to OEM. Take a look at you tubes Prius rear window wiper improvement vid. Read more: http://priuschat.com/threads/rear-wiper-improved-sweep.125028/#ixzz2QGWGDnpO