While I am a staunch anti-Cold activist (
), I have to make an admission:
My diapers/nappies (whatever you call them) were soaked and washed in cold water. Living on a farm with water heated instantly with gas bottles teaches conservatism - namely not using all the gas for laundering, otherwise, someone might have an uncomfortable experience in the shower if the gas and pilot goes out(!)
We used Napisand, a "sanitising" product for nappies with Oxy bleaches, and probably Cold Power. I was, of course, too young to remember.
All washed in a suds-saving Top-Loader. We still have those diapers/nappies and they're clean, if a bit worn (but not tatty).
However, I converted to Warm and Hot washes. My clothes are cleaner for it, and I've become a better person LOL
If needed, I add a Pre-Wash and even a soak on the Miele if the soils are sensitive to heat.