A lot of washing machines offer different washing modes which change various run settings: Cotton (or 'General'), Towels, Bedsheets, Wool and so on. Most even have settings for 'Eco Mode' - which (if the advertising is to be believed) are purportedly more Eco-conscious than the standard 'Cotton' Wash - using less water/cycles, lower temperatures/spin speeds to save resources.
But, how do these Eco modes compare to another setting - the 'Quick Wash'? Is it more sustainable to run quicker washes, (ostensibly similar settings to a regular 'Cotton' wash but... quicker), vs running a longer wash in Eco mode?
I realise that different makes and models offer different values and settings, have different definitions of what constitutes an 'Eco' mode, or even the ability to run every mode with 'Eco' turned on, but I'm only after generalities here.
I'm also only interested in the settings as they apply to washing general 'worn' clothes (office, casual, sportswear etc) - obviously it makes more sense to run dirtier loads on more intensive settings rather than running them through more than once.