I've just made a pint of washing machine liquid. It's from this site. I didn't dilute it with cold water though. I used :-
30 fl.oz of hot water
3 tbsp borax
3 tbsp washing soda
2 tbsp Fairy Liquid (the new Orange and Lemongrass smell)
You need to use about 2 fl.oz per load, which is a full up cup, not just filling up the centre, of the cap from a normal bottle. This should last about 10 loads.
And the cost:-
Washing soda 90p (from Tesco)
Borax £6.48/kg (from Ebay)
Fairy Liquid £1.00 (from every shop under the Sun), but any good quality brand will do.
Each mix, as above, will cost approximately:-
Washing soda 4p
Fairy Liquid 6p
Each load will cost approximately 4p
I usually by Ariel Liquid Washing Machine Detergent. The cheapest I could find online was a Pack of 6 x 20 washes (from Amazon) for £25.74. That works out at 21p/load.
Every time I put on a load, I shall squirrel away the difference in my 'running away' fund!