Yeah make sure you don't use the stuff from Halfrauds etc as it can block up the windscreen washer jets.
The VW stuff is specially formulated for the 'fan' type washer jets to prevent them getting blocked up.
Just go to your local dealer and they will give you the right stuff, it's only £3 a litre and you can dilute it. It smells nice too.
They will tell you how strong to mix it, might want to have it quite strong at this time of year.