Roscoe62....
LOL...
That was why I commented that we 'wash slightly differently'...we don't have to deal with the icy winters that North America gets...
We don't get snow in winter (though some places do) and even when it's -8c, which is cold for us, clothes will be mostly dry when put outside provided you get them in before 4.30pm...
In answer to your question about 'Whites retaining white', if the detergent is removing the soiling, regardless of if washed in hot, warm or cold water, then the whites should still be white...
Our consumer magazine here tests ALL detergents in 'cold' (20c) water....the top performer removed 86% (OMOMATIC) followed by Radient (81%) and then COLD POWER (79%)...differences of 6% or more are generally visible without special equipment...
These were all powders.
Liquids are only a small proportion of our market, even though there are plenty of them, and Choice reqularly comments that they don't clean as well...so they don't tend to test them. Personally, I don't use them and never have...I'm 'old school' when it comes to my primary laundry detergents - POWDERS only...
Only you will know if you are happy using cold water. There is no harm in trying it though, or use a tempered cold wash rather than tap cold...
But my comments about bacteria still stand....the sun, when available, is the safest, cheapest, and best way to kill the blighters....