Winter windscreen washer fluid

It’s a good idea to have extra winter windscreen washer fluid in the boot. When passing cars are splashing slushy, dirty snow on your windscreen, you do not want to have an empty windscreen fluid reservoir. After a while, you will see almost nothing through the windscreen. If you can expect really low temperatures, you will want to use a winter mixture that won’t freeze down to −20°C or even lower.