When you always check your car, you will know when repair is needed. People, who often neglect their cars, always have themselves to blame. So, you should always check the windows of your car on daily basis.
Once you discovered any crack on the surface of these windows, you should get it repaired. As you do this, you keep your car in top form. You won't need to spend huge amount on this.
Always Look Out For Experienced Technicians
As a matter of fact, you should get experienced technicians to help fix up your car. Go for one that has rendered similar service successfully. Charges may be high but you will get the best service.