I've noticed all kinds of green claims and labels on a number of cleaners, specifically dishwasher detergents. What makes a these cleaners green?

We've seen these eco-friendly claims and labels, too. Some are meaningful, others meaningless. Terms like "natural," "environmentally friendly," and "nontoxic" lack standard definitions. Even "biodegradable" means little unless the information is specific, such as "biodegradable in three days" or "certified biodegradable."

But some of the claims you'll see aren't greenwashing and can point you in the direction of greener cleaners. A statement that a detergent is "certified biodegradable" has been independently verified, as is the Leaping Bunny symbol on Earth Friendly and Seventh Generation detergents. The presence of that logo indicates that a product wasn't tested on animals during any stage of its development. Keep this shopping tip in mind: Look for specific claims such as "contains no artificial dyes or fragrances," then look at the ingredients list if there is one, which might help confirm the claim.

In the end, you'll probably want a detergent that cleans well. In our August 2009 report on dishwasher detergents (story and ratings available to subscribers), one Cascade detergent was excellent and five other cleaners were very good, including the phosphate-free Method Smarty Dish tablets (shown).
Other tested detergents without phosphates tended to perform worst overall. Method's success might be due to the amount and type of enzymes in its formulation. Enzymes help break up food for easier removal.

Whichever dishwasher detergent you use, follow the tips below to get the cleanest dishes. And remember, don't machine-wash items made of brass, bronze, cast iron, disposable plastic, gold-leaf china, or wood.

1. Load large items at the sides and back of the dishwasher so they don't block water and detergent from other dishes.
2. Orient the dirtier side of dishes toward the center of the machine.
3. Don't let dishes or utensils nest or rest side by side. If your dishwasher has an open basket, mix spoons, forks, and knives so they won't nest together.
4. Use the top rack for plastic and more-delicate items.
5. Rest glasses on prongs so they stay upright and don't fill with water.
6. Load silverware with handles down; knives, with handles up. e-mail | Twitter | Forums | Facebook

Essential information: If you're in the market for a new dishwasher, read our latest report and check out our free buyer's guide.