@Fluffycloudland77
It is true, we do always have bacteria on our bodies. It is all around us. But by washing in cold water and not using proper detergents, you're creating a bacteria breeding ground within your machine, which ends up all over your washing. Within a a few days, this could be up to 4 times the average level of bacteria found on a clean person, so imagine what it's like over a few months. Whilst it's fine to have a certain level of bacteria on your clothes and body, there is a limit for a safe/healthy amount that is maintained by regular cleaning. I mean, you're never going to eradicate all bacteria no matter how much you wash, but by killing bacteria as part of our laundry we are maintaining a healthy level.
A recent study found that constant cold and warm washing can result in excessive growth of E. Coli, salmonella and norovirus in the machine, which cross-contaminates wit h towels, dishcloths clothes etc. Washing at 30 also proved to leave behind a much higher percentage of faecal bacteria on underwear which unavoidably transfers to your machine and other laundry. Do you really want to be throwing your kids clothes into a bacteria breeding ground with poo all over it?
I mean, think about it:
You wipe your kitchen sink down with a dishcloth and throw it on the washing basket.
Your last wash, on cold, had underwear in if that contained tiny, unavoidable particles of poo.
Your dishcloth goes in the machine and gets all the bacteria from those particles that weren't killed in the cold wash all over it. Even washed on 20 or 30 degrees, that won't shift it. Warm and damp, perfect bacteria sex pit.
You then use that cloth again to clean your kitchen or wash your dishes and transfer all that bacteria to your worktops and dishes which continues to grow.
No offence, but I wouldn't let you do my washing.