Did a load of colors a few days ago. The cycle I used on our Electrolux was cottons cold with extra quick and gentle (that's 25 min. wash, deep rinse, spin, medium level rinse, spin, med. level softening rinse, 1400 rpm spin). I measured the water temperature both at the beginning and at the end of the main wash: 18°C (65 Fahrenheit).
Visibly, the clothes were clean but there was still *some* BO left - though I have to say that I wore that particular shirt two days and its second day was especially challenging, since I was running through the airport to catch my flight...
I don't quite know what to make of the result. I think I would have to try washing another load in cold water with Persil gel so I can compare. Or I could try the non-shortened cycle...
One thing to note, though: I didn't use any softener to see whether the gel gets thoroughly rinsed from my clothes, which it did BTW. What I'm saying is, maybe the softeners I used always masked any BO left on my clothes and I never realized clothes weren't perfectly clean?
A definitely positive effect: the wash only took 61 minutes and used 0,31 kWh. Pics to follow!