Good to know: "My husband owned his own A/C business for a long time....he said everything on here is the PROPER way to do this.....do it yourself, will make unit not work so hard and you save $ by not paying the A/C company!" Our electric bill rose to $430 two years ago and a simple A/C cleaning lowered it to $150. Totally re-pinning this.
This has already been posted, but I never saw it. Clean shower door with a Magic Eraser, water, and elbow grease (or use the old dish detergent and vinegar trick with the Magic Eraser). After cleaning - rub Rain-X all over the door! It should keep it clean 4+ months.