If you would like to mix your own antifreeze, you can find instructions for it here:
Homemade antifreeze for the windshield washer system
For this, you need methylated spirits and dish soap. Mix 1 L of methylated spirits with one cup of water and 2 tbsp of dish soap. This mixture is frost-resistant down to -37 °C.
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Photo by Sabine, meinhaushalt.at