Most people think the way to get the job done is to wash everything in a single load with cold water. That way, you get it all done at once, and there’s no color transfer between clothes, but that’s not always the case. Washing everything together in cold will prevent color transfer, but unfortunately it won’t get everything clean.
When to wash in hot water
Hot wash works well on ground-in and hard-to-remove dirt on sturdy fabrics.
Generally speaking, you should wash white clothes in hot water. Washing colors in hot water is also recommended if the clothes are really dirty or greasy, and they’re made of sturdy, color-fast fabric. (Wash them separately, of course.)
Use it to clean seriously soiled sturdy garments (gardening or children’s clothing), and to regularly disinfect dish towels, washcloths, bath towels, bedding, and pillowcases.
Light and dark fabrics should be separated as hot water may cause these clothes to bleed.
Delicate and coarse or sturdy fabrics should be separated to prevent abrasion and protect clothes from wear and tear.
 When to wash in warm water
Warm water (or permanent press wash setting) minimizes color fading and wrinkling. Wash light clothes, as well as regular and sturdy fabrics, towels, jeans, 100 percent manmade fibers, and blends of natural and manmade fibers. It’s also appropriate for moderately dirty clothes that don’t need the extra power of a hot water temperature wash.
 When to wash in cold water
Washing clothes with cold water will protect most dark or bright-colored clothing from running and minimizes shrinkage. Use the cold wash cycle for lightly soiled fabrics and clothes with blood, wine or coffee stains, dark or bright colors that may run or fade, delicate fabrics including washable silk, Spandex swimsuits, and active wear; and delicate lingerie. It’s also okay for lightly soiled clothes.
There’s a misconception that washing clothes in cold water won’t get clothes clean. This is because detergent is formulated for, and fully activated in, warm water. Cooler water won’t fully activate detergent, which means you’ll need to use more to make up for the temperature difference to get your cold wash clothes clean. Thankfully there are several brands of detergent that are designed to work in all temperatures. Tide, Arm & Hammer, All, and Wisk are just a few that we recommend.
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