Cold water is less damaging to most fabric fibers than hot water, especially wrinkle-prone fabric such as cotton and linen.
Warm water can help to loosen and remove dirt and stains from clothes more effectively than cold water. This can be especially useful for heavily soiled or dirty clothes.
When to Use Warm Water – For man-made fibers, knits and jeans, use warm water (90°F). Most of your clothes can be washed in warm water. It offers good cleaning without significant fading or shrinking. When to Use Cold Water – For dark or bright colors that bleed or delicate fabrics, use cold water (80°F).
Cold rinse is most effective because of the surface tension of water - cold dislodges surfactants like detergent better. Which is the same reason warm water washes work better - it allows the surfactants to work harder, dissolves oils from body and environment better.
Research has shown that the temperature of the water doesn't really make a difference.” So a good scrub is more important than the water temperature. And research has shown that using washing up liquid to kill bacteria is important.
There are still multiple reasons for clothes shrinking even after using cold water. The washing cycle of the washing machine and the temperature can cause such an effect. So, it's better to lower the temperature and set the gentle washing cycle for how to avoid clothes from shrinking.
Warm water is a good choice for effectively cleaning clothes without damaging the material. This temperature will work best for most loads, including lightly soiled cotton, synthetic blends, linen fabrics and manufactured fibers.
60°C is the perfect temperature for killing bacteria, viruses and removing stains. This wash setting is also highly recommended for washing towels and bedding, but obviously this setting is going to increase running costs as the higher the temperature the higher the cost.
Similarly, hot water may cause your clothes to shrink and fade color over time. Typically, fabrics that are safe to wash with hot water include certain synthetic fibers such as nylon or polyester, as well as preshrunk cotton. Never wash materials such as wool, silk, viscose, or other delicate fibers with hot water.
Towels should be washed in the warmest water appropriate for the fabric according to the care label. Generally, warm or hot water is recommended for washing towels. Use a cycle specifically for towels or a normal/regular cycle.
Shrinking often occurs when a garment is exposed to excessive heat, either in the washing cycle or while tumble drying. Your label's drying instructions will indicate whether the garment can go through a regular dry cycle, if it should be tumble-dried, or if it requires other care like drying flat or line-drying.
Let us break it down for you why: Hot water is generally more capable at removing grease from dishes, which explains why washing the dishes in cold water or room temperature water may sometimes result in a nasty and persistent greasy film on your dishes even after the dishes are dried.
Hot water cannot bond with any insoluble dirt, making it a better medium to clean than cold water. Therefore, hot water is more effective for cleaning purposes than cold water as it has higher kinetic energy, extra space between its molecules, and is more compatible with detergents.
Wash jeans in warm water: Most of the time when you have something that you want to wash gently you wash it in cold water. But that's not the case when you are washing denim jeans. Warm water will help the color stay in the jeans and help keep the jeans from shrinking. Hot water is too hot and can destroy the fabric.
Don't wash those clothes
This is an odd one. According to folklore, if you wash clothes on New Year's Day, you'll be “washing for the dead” or washing a loved one away -- meaning someone in your household will die in the coming year. Get your laundry washed, dried, folded and put away by New Year's Eve.
Sheets should be washed at a warm temperature to kill bacteria. A good temperature to wash bed sheets is 40 degrees but a 60-degree wash will be better at killing germs and should be used if someone in the house has been ill. As always, it's best to consult your bedding care labels for guidance on temperature.
Avoid hot water – high temperatures will cause cotton to shrink, so opt for a delicate cycle or a cold wash to avoid your favorite cotton items from shrinking. Flip them inside out – to protect the outside of the garment from the abrasive agitation of the washing process, turn them inside out.
Cold water is fine for most clothes and other items that you can safely put in the washing machine. It can remove many stains from clothing, including grass on your kid's jeans or makeup smudges on a sweater. Delicate fabrics (lace and silk) and dark, colorful fabrics actually do best in cold water.
Wash with the hottest water temperature setting listed on the care label. Polyester blends are best washed using warm water, while cotton can toleratehot water. Hotter water kills most germs and also takes care of dust mites that thrive in bedding. Wash at least once every other week.
The washing process can agitate or loosen dyes and hot water temperatures are typically known for causing color bleeding. Turning your clothes inside out before washing can help to reduce fading.
When to Use Warm Water – For man-made fibers, knits and jeans, use warm water (90°F). Most of your clothes can be washed in warm water. It offers good cleaning without significant fading or shrinking. When to Use Cold Water – For dark or bright colors that bleed or delicate fabrics, use cold water (80°F).
As the water molecules move around, they tug at the detergent which in turn tugs at the fatty molecules in the stain, breaking the stain apart. At higher temperatures all of this molecular dancing around occurs with greater speed and energy and the stain is removed from the fabric more readily.