Do not scrape it, do not soak it in cola. How to actually clean insects off your windscreen
Summer is the season of road trips, warm air through open windows and total biological carnage. Anyone who has driven along a country road in June knows the scene. The sun is setting romantically on the horizon, but you cannot see it because the view is blocked by the remains of well fed bumblebees that met your windscreen at 90 km/h.
Welcome to the greatest nuisance of summer motoring. This is not just dirt. It is chemical warfare. Scientists may warn us that insect numbers are falling and that we should worry about biodiversity, but when you are rubbing at the windscreen beside the road, it is hard not to feel that nature has chosen to send its final survivors directly into your car.
Why does this glue refuse to come off?
Scientists and car care specialists have studied insect stains more closely than most drivers would expect. Dried insect remains contain proteins, chitin and polysaccharides. When that mixture is baked by the summer sun, something close to polymerisation takes place on the glass. The insect becomes a kind of superglue, stubborn enough to test both your patience and your paintwork.
Ordinary screenwash and wipers often make matters worse. Instead of removing the mess, they smear the protein cocktail across the windscreen in a thin, cloudy film. Technically, you have cleaned the glass. Practically, you have made yourself a biology based privacy screen.
The big myths and bad ideas
Desperate drivers can be inventive. Sadly, not every bright idea belongs anywhere near a car.
Washing up liquid, including products such as Fairy, does remove grease and can shift insect remains. The problem is that it can also strip protective wax from the paint and damage the rubber on your wiper blades.
Kitchen sponges, especially the rough side, are another false friend. They will remove the insect, but they may also leave the windscreen covered in microscopic scratches. The reward arrives later, when night rain turns every headlight into a dazzling little fireworks display.
Coca Cola and WD 40 also have their fans online. Reality is less kind. Cola leaves a sugary film on the glass, which attracts fresh dust like a magnet. WD 40 creates a greasy layer, and at the first shower you may discover that your wipers are simply skating over oil while visibility drops to nothing.
What actually works?
The best approach is not aggression, but chemistry and patience.
Enzyme based insect removers are usually the most effective specialist products. They break down organic proteins, which is exactly what dried insect remains are made of. Spray the cleaner on, leave it to work for a few minutes and rinse it off before it dries in direct sunlight.
If the glass still feels rough after washing, enthusiasts often use detailing clay. It lifts microscopic pieces of chitin from the surface without scratching the glass. It is not something you will start doing at the roadside, but after a long trip it can make the windscreen feel properly clean again.
Stuck in the middle of nowhere? Use water and time
Sometimes there is no specialist cleaner in the car, no filling station nearby and the wipers are only spreading the mess into dangerous stripes. The answer is simple: wet soaking.
Water is the universal solvent. It just needs time. Take a fleece, an old shirt or, if there is nothing else, paper towels or newspaper. Soak it properly with water, even drinking water will do, and place the wet fabric or paper directly over the insect stains on the windscreen.
Leave it there for 10 to 15 minutes. During that time, the water works its way through the dried chitin and softens the protein glue. When you lift the cloth away, most of the insects should come off with little or no scrubbing. Rinse with clean water and the road ahead becomes visible again.
The best defence is preparation
Do not rub, do not scrape and keep kitchen tools away from the car. Against nature, patience and simple physics usually work better than force.
The best defence, predictably, is preparation. Use glass sealant or a rain repellent treatment such as AquaPel or Rain X. A hydrophobic layer stops that protein glue from gripping the tiny pores in the glass quite so firmly, which makes the next wash far easier.
After that, once the insects are gone, you can return to the more traditional summer pastime of quietly grumbling about cyclists and electric scooter riders.
