Washing temperatures explained: 20, 30, 40 or 60?

01Why temperature matters

Every wash is a balance between four things: getting clothes clean, keeping them looking good, keeping them hygienic and using as little energy as possible. Temperature affects all four. Warmer water helps detergent dissolve and work, loosens grease and body oils, and reduces bacteria. It also fades colours faster, shrinks some fabrics, sets some stains and costs more to heat.

For years, many people washed most things at 40°C out of habit, and older advice often said hotter was always cleaner. Modern detergents have changed that. Many now work well at 30°C or even 20°C for lightly worn clothes, while higher temperatures are still useful for towels, bedding, very dirty items and times when hygiene matters most.

This guide explains what each common setting is good for, what it does to different fabrics, how temperature interacts with stains and detergents, and how to choose quickly on wash day.

02Cold and 20°C washes

Cold and 20°C washes have become popular because they save energy and are gentle on fabrics.

0330°C

30°C is the everyday setting for many households and works well for most clothes.

0440°C

40°C is the traditional all-rounder and still a good choice for many loads.

0560°C

60°C is the setting most often recommended when hygiene matters.

0690°C

Very few household items need a 90°C wash, and many cannot take it. Some heavily soiled white cotton, such as certain kitchen cloths or very dirty work items, may be labelled for it. Most people rarely, if ever, need this setting.

07What temperature does to fabrics

08Temperature and stains

Different stains react differently to heat. Getting this wrong can set a stain permanently.

09Temperature and hygiene

Higher temperatures reduce bacteria and other microorganisms in laundry. That matters most for items that touch the body closely or carry germs.

10Temperature and energy

Most of the energy a washing machine uses goes into heating water. Lowering the temperature is one of the simplest ways to cut the energy each wash uses.

• Washing at 30°C instead of 40°C uses noticeably less energy.
• Cold or 20°C washes use less again.
• Save 60°C for towels, bedding and items where hygiene matters.
• Full loads use energy more efficiently than half loads.

11Choosing on wash day

Ask three questions for each load:

• What is the lowest maximum temperature on any label in the load?
• How dirty are the items?
• Does hygiene matter especially for these items?

Then choose the lowest temperature that will get the load clean, within the label limit. Everyday clothes: 30°C. Dirtier cottons: 40°C. Towels and bedding: 60°C if labels allow. Delicates and wool: cold or the wool cycle.

12What the dial really means

The number you choose on the dial is a target, not always the exact temperature the water reaches throughout the cycle.

13Detergents and temperature

Detergent and temperature work together.

14Whites and temperature

White cottons are the items that benefit most from warmer washes, because body oils left in the fabric gradually turn them grey or yellow.

• Wash white cotton shirts, underwear, towels and sheets at 40–60°C if labels allow.
• Pre-treat collars, cuffs and underarms.
• Wash whites only with whites.
• If whites have greyed after months of cool washing, a few washes at a higher temperature, within the label, often brighten them.

15Darks and colours

Darks and brights look best when washed cool.

• Wash dark and bright colours at 30°C or below.
• Turn them inside out.
• Use a colour detergent without bleaching agents.
• Wash new dark or bright items separately for the first few washes.

16When someone has been ill

When someone in the household has had a stomach bug, a cold, flu or another infection, laundry deserves extra care.

• Handle soiled items carefully, ideally with gloves, and do not shake them out.
• Wash their bedding, towels and clothes separately.
• Use the highest temperature the labels allow, often 60°C for bedding and towels.
• Dry fully.
• Wash your hands after handling soiled laundry.
• Clean the machine afterwards with an empty hot or maintenance cycle if the manual suggests it.

For items that cannot be washed hot, a laundry sanitiser product can help; follow the instructions.

17Babies and young children

Baby clothes, bibs, muslins and cot sheets often get soiled with milk, food and nappy leaks.

• Rinse protein stains such as milk and nappy leaks in cold water first.
• Wash cot sheets, muslins and bibs warm to hot, as labels allow.
• Many parents prefer a non-biological or fragrance-free detergent for babies.
• Wash new baby clothes once before use.

18Temperature guide by item

This table gives a starting point for common household items. Always check the label first; it overrides any general guide.

19Hand washing temperatures

Hand washing is usually done in cool to lukewarm water, which is kinder to delicate fibres and comfortable for your hands.

• Use water that feels cool to just warm.
• Rinse in water of a similar temperature; sudden changes can shock wool fibres.
• Use a gentle detergent made for hand washing or wool.
• Never use very hot water for wool or silk, even by hand.

20Drying temperatures matter too

Temperature does not stop at the wash. Dryer heat can shrink, fade and set stains just as wash temperature can.

• Dry delicates, synthetics and elastane on low heat or in the air.
• Towels and cotton sheets can usually take normal heat.
• Remove items promptly once dry; over-drying causes shrinkage and stiffness.
• Check that stains are gone before drying.

21Sportswear in more detail

Sportswear is a common source of confusion. It gets very sweaty, which suggests a hot wash, but the technical fabrics it is made from dislike heat.

22Reading the washtub symbol

The washtub symbol on a care label carries the temperature limit and the cycle type.

• A number inside the tub is the maximum temperature in °C.
• Dots inside the tub are an older way of showing temperature: one dot cool, more dots hotter.
• One line under the tub means a gentler, synthetic cycle.
• Two lines under the tub mean a very gentle wool or delicate cycle.
• A hand in the tub means hand wash only.
• A cross through the tub means do not wash.

23A little science: why heat helps cleaning

Four things work together in every wash: chemistry from the detergent, heat from the water, movement from the drum and time. Washing experts sometimes describe these as a circle. If you reduce one, the others have to do more.

Lower the temperature, and you need a detergent that works well in cool water, a cycle that moves the clothes enough and enough time for the detergent to act. That is exactly how eco programmes work: cooler water, but longer cycles. Raise the temperature, and oils melt and loosen more easily, detergents dissolve faster and stains lift more quickly, so a shorter cycle may be enough.

Understanding this balance explains why a quick 20°C wash on a heavily soiled load disappoints: low heat, short time and perhaps too little detergent leave the chemistry with too much to do. It also explains why a long eco wash at 30°C can clean as well as a shorter wash at 40°C. You can trade heat for time, or time for heat, but you cannot remove both and expect the same result.

24Delicates and temperature

Delicates are where temperature mistakes do the most lasting damage.

• Silk: hand wash cool, or dry clean. Warm water can dull silk and cause water marks.
• Lace and lingerie: cool, gentle cycle in a mesh bag, or hand wash.
• Fine knits and cashmere: cool hand wash or wool cycle, dry flat.
• Embellished items: cool and gentle, inside out, often by hand.
• Viscose and rayon: cool and gentle; these fibres weaken when wet and warm.

If a delicate item has no label, treat it as hand wash cool, or ask a professional.

25Tea towels and kitchen cloths

Tea towels, dish cloths and cleaning cloths carry food residue, grease and bacteria from kitchen surfaces. They are among the household items that most benefit from a hot wash.

• Wash them separately from clothes and bath towels.
• Use 60°C or hotter if their labels allow.
• Use a full-length cycle rather than a quick wash.
• Dry them fully, and never leave damp cloths bundled up.
• Replace cloths that still smell after a hot wash.

Microfibre cleaning cloths are the exception: they usually need cooler washes and no softener, so check their labels.

26When there is no label

Labels get cut out, fade away or were never there, especially on older, handmade or vintage items. Without a label, you have to make an informed guess, and the safest guess is always the gentlest one.

Look at the fabric and feel it. Sturdy cotton or linen that has clearly been washed before can usually go at 30°C on a normal cycle. Anything that feels like wool, silk, viscose or a fine knit should be hand washed cool or taken to a professional. Anything with beads, sequins, lining, structure or padding is best left to a dry cleaner. Test colour fastness first by dampening a hidden seam with cool water and pressing it with a white cloth; if colour comes off, wash the item on its own. When in real doubt about a valued item, ask before washing, because heat damage cannot be undone.

27Troubleshooting by symptom

28Temperature and running costs

Every wash has a running cost made up of energy, water, detergent and wear on the machine and on your clothes. Temperature affects most of these.

29Curtains, rugs and large items

Large household items often have their own temperature limits and may not fit a home machine. Curtains, especially lined or blackout ones, often need cool washes or dry cleaning. Small washable rugs and bath mats may be labelled for 30–40°C, and some rubber-backed mats should not be washed hot. Check every label, and if the item barely fits in the drum, it will not wash or rinse properly at any temperature.