(Photo: Kang Kim)

The Best Bet
The laundry process remains a mystery to many. Why do colors get dull? (Soap buildup; try some vinegar in the wash cycle.) And why doesn’t powdered soap dissolve? (You’re using too much.) In fact, powder is more environmentally friendly than liquids. And regardless of the detergent chosen, consider always using cold water. Not only does it save energy, cold water is effective in cleaning all colors and materials—including expensive denim. The best powder for cold-water washing? Seventh Generation Free & Clear ($7.99 at Whole Foods, 250 Seventh Ave., at 24th St.; 212-924-5969) has no dyes, phosphates, or chlorine bleaches. For more on how to optimize your laundry, turn the page.