Underwear and lingerie are extra delicate and fragile. So always remember to use a sealed laundry bag. In this way, you are preventing the metal clasp from damaging your washing machine as well.
Did you know that cotton clothes actually can be washed, dried and heated several times without any notable marks? But instead of bleaching it, you can easily use lemon juice for stains and vinegar for bad smell. This both benefits your clothes and the environment.