I have used Sparkle Tech twice now and have been extremely pleased with their work on both occasions. The first time I used them they cleaned 10 years worth of indoor film plus 10 years of outdoor dirt and rain spots off my windows; my windows were positively spotless and glossy clean when they finished. They also did an amazing job on cleaning my filthy window screens. I highly recommend Sparkle Tech as they do a great job and at a very fair price.