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Screen wash solution mix....don't laugh

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mizfiesta | 16:49 Sat 29th Dec 2007 | Motoring
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I have just bought a 500ml bottle of concentrated screen wash. The directions instruct me to use a mixture of 25% screenwash to water, in winter months. My question is, for this 500ml bottle of screen wash, how much water do I dilute it with? My brain is just going numb and I cannot work it out! Math etc, has never been my strong point ha.
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Hi mizfiesta:

What ever amount of water you measure out add a 1/4 of that amount of screen wash.

Loon
25% is one fourth, so the other THREE QUARTERS of the solution must be water.

Therefore, measure out some cleaner and add three times as much water, ie:
100ml cleaner to 300ml water, or
50ml cleaner to 150 ml water.

Probably best not to mix up the whole bottle at once -- some chemical solutions don't keep as well once diluted with water.
Question Author
Thanks for your help Loon. Much appreciated.
Just saw Loon's answer when I submitted mine -- adding 1/4 as much cleaner would make a 20% solution, not 25. To make it 25% you need to add one third as much cleaner as water.

But you reminded me that yes, I should have said it's generally safer to add a chemical to water rather than water to a chemical. Sorry.
Question Author
I've just made up the solution using the 500ml of screenwash to 2000mls of water...that ok? I just made the whole lot up as it's for my screen washers on car and the container under the bonnet should take what I've made up.
It would have been simpler to buy a two and a half litre of ready mixed screen wash from Halfords.
Question Author
Ha, yea Toureman, the next time I will. My brain cells must be diminishing with age as I felt I was on the Krypton Factor or something!
one and a half litres of water for your whole bottle of screenwash, making 2 litres in total..

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