Facts about Bleach

Four facts about bleach I've never heard before:

• When mixing with water, as you are supposed to, always use cold water because hot water makes bleach ineffective. (What!?)
• Bleach degrades over time, so you can't stockpile it. 
• Protect your bleach from sunlight.
• Wash the surfaces you want to disinfect before spraying with your bleach/water mixture, because organic matter (like food) inactivates bleach.

From this, you can probably tell I've never taken a chemistry class. I've always thought of bleach as this mighty substance but now it seems as though it's a household wimp.

I do know better than to mix it with ammonia, though.