sratched windows

[omodos]

anyone any idea on how to minimize this?weather out here means that we get more grit and dirt in the rain than acual water, and car is not always sheltered and for a second time now some grit sand or whatever has lodged down in the window thus scratching it as it goes up and down!...any ideas on how to minimize this?avoid it?I used a spray lubricant did help, but want to avoid it in the future, would perhaps using a high quality water repelent polish on the glass help ?