Some commercial products repel water from your windscreen as you drive in the rain. This helps greatly with visibility and also makes it easier to remove ice when it forms on your windscreen. While not expensive, if you want to make a water repellent at home, you can do so with a handful of ingredients. Either make a simple solution with water and rubbing alcohol, or make a repellent that follows more closely the ingredients in shop-bought windscreen water repellent.
Things you need
- Rubbing alcohol (isopropyl alcohol)
- Filtered water
- Spray bottle
- 100 ml (3.5 fl oz) graduated cylinder
- Silicone oil or castor oil
- Graduated cylinder
Pour 125 ml (1/2 cup) of rubbing alcohol into the measuring cup. Pour this into the spray bottle.
Measure out 250 ml (1 cup) of filtered water and add this to the spray bottle.
Swirl the bottle to mix the two ingredients. The bottle will feel warm, but not hot. Wait until it cools before putting on the cap.
Spray the solution on to the exterior of a clean and dry windscreen. Use a clean and dry rag to wipe the windscreen until it is thoroughly dry.
Measure 90 ml (3.2 fl oz) of the ethanol into the graduated cylinder. Pour this into the spray bottle.
Measure 5 ml (1 tsp) of rubbing alcohol and pour this into the spray bottle.
Measure 10 ml (2 tsp) of silicone oil or castor oil in the graduated cylinder and add this to the spray bottle. Use a clean spray bottle; don't add to the solution from earlier.
Swirl the bottle to mix the ingredients. The bottle will feel warm, but not hot. Wait until it cools before putting on the cap.
Spray the solution on to the exterior of a clean and dry windscreen. Use a clean and dry rag to wipe the windshield until it is thoroughly dry.
Tips and warnings
- Thoroughly dry the windscreen after you apply either solution or you will get streaking and an uneven application of the mixture.
- Measure out the alcohol in a well-ventilated area away from flames.
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