Gabriele,
Remember, you are in Italy. Hot water for you is genuinely hot. You have phosphates, low-temperature boosters, four different enzymes, quick acting oxygen bleaches and machines designed to get the most out of these chemicals.
Americans, unless they are savvy people like the members of this board, have to get by with very cold water ("hot" in America is barely 40°), no phosphates, unsuitable programs for enzymes (in case the detergent even has them), oxygen bleaches without our activators and the chlorine hammer as a last resort.
It's always: Time, agitation, temperature, chemicals.
Since the chemistry is castrated by stupid laws in the US and the 110v weak electrical system makes proper heating cycles hard, you have to make up for it somehow.
Soaking does that.
Remember, you are in Italy. Hot water for you is genuinely hot. You have phosphates, low-temperature boosters, four different enzymes, quick acting oxygen bleaches and machines designed to get the most out of these chemicals.
Americans, unless they are savvy people like the members of this board, have to get by with very cold water ("hot" in America is barely 40°), no phosphates, unsuitable programs for enzymes (in case the detergent even has them), oxygen bleaches without our activators and the chlorine hammer as a last resort.
It's always: Time, agitation, temperature, chemicals.
Since the chemistry is castrated by stupid laws in the US and the 110v weak electrical system makes proper heating cycles hard, you have to make up for it somehow.
Soaking does that.