Choosing the right water temperature for laundry is more than a matter of preference—it can determine whether your favorite jeans keep their color or shrink beyond wear, according to Michelle Piombino, principal scientist at Henkel for Purex Laundry. In an interview, Piombino outlined five categories of items that should never be exposed to hot water, along with four that actually benefit from a hot cycle.
Before loading the machine, Piombino urges consumers to check the care tag on every garment. The tag specifies the recommended cycle and water temperature, and following it is the simplest way to avoid permanent damage. For items that lack clear instructions, the following guidance can help.
Why Dark Colors and Delicates Need Cold
Dark clothing—such as jeans, black tops, and other deep-hued garments—should be washed in cold water, Piombino says. Cold water is gentler on the fabric, helping to prevent fading, preserve color, and reduce the risk of dye bleeding that can stain other items in the same load. Jeans, in particular, are prone to both fading and shrinkage when exposed to hot water.
Delicate fabrics like silk, lace, and wool also require cold water. Hot water can cause these materials to shrink, lose their shape, or even tear. Piombino advises hand washing or using a gentle machine cycle with cold water, depending on the care tag's instructions.
Athletic Wear and Blood Stains: Special Cases
Although it may seem logical to wash sweaty gym clothes in hot water, Piombino warns against it. Leggings, sports bras, and other athletic apparel often contain elastic fibers that can break down under high heat. Cold water helps preserve the elasticity and overall integrity of these garments.
Blood-stained items are another exception. Hot water can set the stain, making it nearly impossible to remove. Piombino recommends rinsing the stain in cold water immediately to remove as much as possible, then pretreating the area before washing according to the care label.
When Hot Water Is the Right Choice
While many items should avoid hot water, Piombino notes that certain laundry benefits from a hot cycle. Bedding, especially if you sweat during sleep, can be washed in hot water to remove body oils, sweat, and odors. Towels—hand towels, washcloths, and bath towels—also tolerate hot water well and can benefit from the deep clean that helps combat grime buildup over time.
White clothing and linens, particularly those made from sturdy cotton, are also good candidates for hot water. Hot water helps break down tough stains like oil and grease, but Piombino stresses checking the care tag first. If the item is safe for hot water, she suggests using a detergent designed for tough stains, such as Purex Advanced Oxi + Coldwater Power Liquid Laundry Detergent.
The takeaway: when in doubt, err on the side of cold water for anything with elastic, delicate fibers, or deep colors. Hot water is best reserved for sturdy fabrics and heavily soiled items that can withstand the heat.
