The halfords advanced stuff is pretty good, buy the concentrate and not the ready mixed. It can resist temps down to -23 if you use it pure, should be fine unless you're planning a trip to Siberia.
I found Asda's screenwash appauling last winter, it was freezing up in temperatures of -5 even with a very high concentrate. I tend to use Halfords premium screenwash.
I do however have 2 bottles of Autoglymn screenwash that I will be trying shortly. Works down to -45 undiluted, however I will probably mix it 1:4. If it's any good I will be buying a 5L bottle of it (£18) which should be good for 3 to 4 fillups in the Volvo.
I use VW screen wash only £2.50 for a litre (Halfords Advanced is £6) and it is rated to -70c undiluted. I generally do a 50/50 mix and it was fine when it was -19c a couple of weeks ago.
Remember everyone the jets are open and the anti-freeze agent will evaporate through the opening leaving a lower concentration and hence raises the freezing point.
I use Autoglym Quick Clear Screenwash, its good down to -45 depending on concentration and more importantly I don't get smears like my wipers are knackered like lots of the other screen washes seem to. I buy it in 5l tubs for about £22 and that makes 50l at summer concentrations.
Halfords sell dome cheaper stuff that's almost neat alcohol with detergents, not their own brand, but used neat it can do -65C, I use that 4:1 if they have stock.
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