You've asked this already and had the correct answer. There isn't a cheaper alternative than cheap screenwash, other than just water. Don't use washing up liquid, it'll gum up the screenwashers.

Proper screenwash is cheap at a supermarket, 5 litres of concentrate is about a fiver and in summer can be diluted 10 to 1.

Ive always used washing up liquid a good 1/4 of a cup to a full bottle of water cuts through everything and smells nice to. Stops blades squeaking too.

You can buy 5 litre bottles of screen wash now, fairly cheaply.

Washing up liquid being a detergent will rot your blades and any rubber surrounds of the windscreen, not to mention blocking up the outlet nozzles.

Good answers from Mark and George, I use about a teaspoon of Dawn each time I fill the Washer bottle with water. When I was living up north in cold country I used the expensive Washer Fluid for the best freeze protection, but still added Dawn.

Generic Windex.

Add a little methylated spirit to the screen wash it will take off all the smears on your wind screen .

Screen wash or washing up liquid.

difficult subject try searching at bing and yahoo just that can assist

I live on a farm, so theres lots of dust, mud (especially during farming season), flies and stuff that sticks to the window, and neat water just wont clean the window properly. Is there anything else I can put in the washer bottle (other than screenwash) that is fairly cheap to buy lots of (or buy regularly) that will cut through dust, mud, flies etc.