What the soap manufacturers are NOT telling you is that “cold” wash is *NOT* straight tap cold.
“Cold” wash means 65*F. That’s about 18*C. That’s why so many washers now have a “cold” setting AND a “tap cold”. The “cold” setting mixes hot water with the tap cold to warm it to 65*
65-degree tap water? I could wish, in southern Arizona in August. My kitchen thermometer says that the cold tap is currently running about 90 degrees F. We won't have cold water again until the ground cools off around Thanksgiving, except for what we keep in the fridge.