Easiest way to clean glass shower doors! Soak paper towels in white vinegar, stick them to the shower door rubbing out all the wrinkles & air bubbles, leave it for a few hours, come back and peel the paper towels off wiping as you go. Hard water and soap scum will just wipe away! Seriously, no elbow grease needed! Cheap, chemical free way to remove hard water.
Photo: How to clean your cookie sheets--Kitchen Miracle Cleaner! You put about 1/4 cup of baking soda in a small glass bowl and squirt in hydrogen peroxide until it makes a nice paste. Then you rub it on the offending dirt/stain/grease...whatever! You can usually just use your fingers...but you can also use a small sponge at times as well. :