I have been a huge fan of our PIAA Super Silicone wiper blades for some time. Last week I ran through a construction zone that splattered tar all up the front of my truck. I had to use Laquer Thinner to clean it all off the windshield. I followed it up by 50/50 alcohol and water mix and then finally Windex. At that point I knew it was as clean as it could be and the initial silicone treatment that comes with the blades was removed. After just a week of wiper use you can clearly see the blades have re-deposited a new thin layer of silicone back onto the window to repel water JUST like they claim. And with proper care they last a long time.