For an effective DIY glass cleaner, follow the same recipe as above to create a water/dish soap spray, just be sure to use distilled water. Water from the tap may be “hard,” i.e. full of minerals that can leave behind residue and streaks. Distilled water, which has been purified by boiling, leaves shiny surfaces clear. “It’s a way to go the extra mile and really make things sparkle,” says Solomon.