Windshield Still Streaky? Try This Simple Cleaning Method

Cleaning the inside of a car windshield can be surprisingly frustrating. You wipe, polish, and inspect the glass until it looks spotless, only to drive into bright sunlight the next morning and suddenly see streaks and smudges everywhere.

Besides being annoying, a hazy windshield can make it harder to see clearly, particularly when driving toward the sun or at night when headlights create glare.

Cleaning expert Brandon, who shares cleaning advice online, recommends a simple method for getting the inside of the windshield clear without leaving behind the streaks that often appear later.

Before you begin, place an old towel across the dashboard. This can catch drips and help protect the dashboard, screens, and other interior surfaces from the cleaning solution.

For Everyday Dirt and Greasy Marks

For ordinary buildup, Brandon recommends 70 percent rubbing alcohol.

The inside of a windshield can gradually develop a film from dust, fingerprints, and residue circulating inside the car. Alcohol can help dissolve greasy buildup and evaporates relatively quickly, which can make it useful for cleaning glass.

Rather than soaking the windshield, use a small amount of product and work section by section. If you are using a spray bottle, take care not to overspray onto the dashboard or nearby surfaces.

The key, according to Brandon, is having two clean microfiber cloths ready.

Use the first cloth to clean the glass, wiping vertically from top to bottom. Then immediately go over the same area with a second, completely dry microfiber cloth to remove any remaining moisture and polish away streaks.

Make sure the cloths themselves are clean. A microfiber cloth carrying detergent, fabric softener, grease, or residue from a previous cleaning job can simply transfer that film back onto the windshield.

What About a Particularly Dirty Windshield?

For heavier greasy buildup, Brandon suggests a homemade mixture of one cup of rubbing alcohol, one cup of water, and one teaspoon of concentrated grease-cutting dish soap.

Because dish soap can itself leave a film if too much remains on the glass, the removal stage is especially important.

For this method, he recommends using three cloths: one damp microfiber cloth to remove the cleaning solution and soap residue, a second clean cloth to dry the windshield, and a third dry cloth for the final polish.

Using more soap is not necessarily better. The goal is to remove the greasy film without replacing it with a layer of detergent residue.

The Simple Trick for Finding Streaks

Whichever method you use, avoid cleaning a hot windshield in direct sunlight. Heat can cause cleaning products to dry before you have time to wipe them away properly, making streaks and spots more likely.

There is also a clever way to figure out exactly where a stubborn streak is hiding.

Clean the inside vertically, moving your cloth up and down. When cleaning the outside, wipe horizontally from side to side.

Then, if you notice a streak while inspecting the windshield, its direction will tell you which side of the glass needs another wipe.

Finally, remember that rubbing alcohol is flammable and produces fumes. Keep the car well ventilated while working, keep alcohol away from flames and other ignition sources, and avoid getting it on delicate interior materials, displays, or other surfaces that could be damaged by it. If your windshield has an aftermarket tint or film, check the manufacturer's cleaning recommendations before using alcohol or other cleaning products.

A perfectly clear windshield does not necessarily require endless scrubbing. Often, the biggest difference comes from using clean cloths, working in the shade, removing every trace of residue, and giving the glass one final dry polish.