Here's a simple way to save water: Stop prerinsing all of your dishes and cups before you put them in the dishwasher. Modern dishwashers are designed to be as energy- and water-efficient as possible, so they are a much greener option than washing by hand. Dishwashing tablets we use today are also far more effective than detergents of the past. The tablets use formulations that activate when they interact with grease, grime and food debris. If your dishes are too clean, the excess detergent will attack the top-rack glassware, leaving scratches and marks on them. Instead, scrape excess food into the trash and place the plate right into the dishwasher for the cleanest clean.