Wait for a few days, forecast is for a short warm spell, then all should thaw out. Then as things cool again, as they are hinting at get the stronger stuff in. Remember it's not the day time temp (hence strength of screen wash) that is important, it's the overnight temp as that is what will make ice out of the screenwash in the line. Once run out of the Halfrauds stuff gonna get some Comma Extreme stuff and premixed it to -25c levels. http://www.commaoil.com/productsguide/view/6/305/XSW5L

Yup me two ill be getting 5lts next week