Before machine washing any of your clothing, you should always consult the garment’s care label. For whites like cloth diapers, undershirts, gym clothes, or underwear, you should wash in hot water that is at least 55°C or 130°F using a specially formulated detergent like Tide Brights + Whites Rescue. This will be the best method remove any heavy soil or germs in these garments. Be aware that not all white garments are created equally, and some are more rugged than others, so your white clothes wash temperature will vary. Hot water can shrink, fade, or otherwise damage some of the more delicate white fabrics, so it’s always best to separate your whites by fabric type to keep them looking fresh.