On Saturday, 9 March 2019 16:42:21 UTC, Scott wrote:
If I use pre-wash on a 60 degree wash programme, what temperature is
the pre-wash likely to be? My understanding is that the pre-wash
should be at a lower temperature using biological detergent with lots
of pauses before moving on to the main wash, where biological
detergent should not be needed due to the temperature.

On most machines, just cold water.
Ideal for removing caked on mud (eg football jerseys)