Wow! Wonder if this is national?

Great find, hope it's national.

It doesn't work, the rain stains my windows a lot worse since using it, I actually thin kit attracts the rain, Going back to usual window cleaner.

Agree with Square72 after a couple days it lets fine rain drops stay on the screen which makes visibility worse so use regularly. Don't use this where your wipers operate, it will clear of the water on the first pass and your wipers will rub on the way back....

£4 in asda lowestoft

Still £4 at Asda Trafford Park

Perfect for glass shower screens, my car windscreen I'm happier using my wipers.

i always found that this stuff stopped working after a few days. I'm getting better results using a waterless wash/wax product, especially on the side windows and wing mirrors (as well as washing and waxing the rest of the car)

still £4 in ASDA Eastlands and ASDA Harpurhey

makes a massive difference on the front windscreen, still need to use wipers though. mistake I made was using on sides and rear (no rear wiper).

£4 at Asda Washington

just tried another Asda and scanned £4 so guess its store specific