When washing whites, it is important to use the correct water temperature to ensure effective cleaning and to minimize damage to the fabric. The ideal temperature for washing whites depends on the fabric and the level of soiling. Here are some guidelines from the search results:

• Hot water: Hot water (130°F or above) is best for washing heavily soiled whites, such as dirty clothes and diapers, as it can effectively remove stains and bacteria. However, some fabrics can shrink and become weaker in hot water, so its important to read the clothing labels before selecting the hot option.

• Warm water: For most white clothes, warm water (between 90 to 110 degrees Fahrenheit) is recommended. Warm water offers good cleaning without significant fading or shrinking.

• Cold water: Cold water (80°F) is best for washing delicate fabrics, dark or bright colors that bleed, and lightly soiled whites. Cold water also saves energy, making it a good choice if you want to be eco-friendly. However, if the water temperature is below 60°F, no soap or detergent performs well.

To ensure your white clothes stay bright, its recommended to wash them separately and not to wash them with colorful fabrics to prevent color bleeding. Its also important to use the appropriate cycle for your washing machine and to use a specially formulated detergent for whites.