Does Hot Water Ruin Bleach

By using hot water instead of cold/tepid water to create a solution, you can render the active ingredients in bleach ineffective, making it totally useless. So for bleach that works, always make sure you dilute it in cold/tepid water.

Does hot water mess with bleach?

“This is actually a myth,” says Johnson. Both chlorine-based bleaches (the liquid jugs you’re used to) and oxygenated bleach (the type found in many laundry boosters, like Tide Whites + Brights Rescue) will retain their effectiveness in warm or hot water.

Should you use cold or hot water with bleach?

Chlorine bleach works most effectively in hot water. It can be used in warm and cold water but you may not see the results you expect.