All, I recently did my yearly application of Aquapel to "rainproof" the windshields. Not sure if many folks are doing that these days? For me its a yearly ritual. I found a very nice video from a youtube channel on cleaning your windshield prior to applying your preferred rainproof. I followed what he did and I noticed an immediate difference. I think the use of a clay bar on the windshield is a good idea as it grabs more than just glass cleaner allowing for a better application. Heres the video.