Washing with cold water is just as effective as washing with hot water, and saves loads(ha) of energy, money and emissions!
Old detergents only worked with hot water, later even though they could work with cold they were still formulated for hot water because that's what everyone was used to. Now that's all over. Machines and detergents are both formulated to work with cold water now.
So it's time to switch to a cold-cold wash if you haven't already.
As a bonus your clothes will last and keep their color longer!
Upload a selfie of you with that machine setting on cold.
P.S. In this short 'taster' competition you may not be able to get to a washing machine with just a day's notice if you use a Launderette. If so send an email to email@example.com letting me know.