EVERYTHING at 30 ... if i feel its really bogging then i might go up to 40 lol i have never struggled to get things clean at 30... i thought detergents were more effective at a lower temperature anyways....
pulled this off the bbc website (random lol )
Select 30ºC washes for dark clothes that can shrink (wool, linen or cotton)
If your washing machine has a cold wash, try using cold-water detergents. (See BBC News: 'Frozen microbes clue to a cold wash')
Reserve 40°C for particularly mucky socks, undergarments and whites
Unless you have an 'intelligent' washing machine, it's best to do one full load rather than two half-loads
Choose the economy setting - it's thriftier with energy than the 'quick wash' setting
Do one full load rather than two half-loads
Use pre-soaks and spot removers for clothes spattered with dirt
Go for concentrated detergents - this means less packaging, so fewer emissions
Turn the machine off afterwards - leaving appliances on standby wastes £700m worth of energy in the UK every year
Wear fewer white clothes - although it may reduce your climate-cooling albedo
Consider buying a new A-rated washing machine when the time comes