Can You Go Through a Car Wash with a Cracked Windshield? | Safelite

Can You Go Through a Car Wash with a Cracked Windshield?

It is not recommended to go through a car wash if you have a cracked windshield. A car wash exposes your windshield to high-pressure water, temperature changes, and mechanical stress, all of which can cause an existing crack or chip to spread. The risk depends on the type of damage you have, and the type of car wash you use, but in most cases, getting your windshield repaired before running your vehicle through a wash service is the safer and smarter choice.

Why Car Washes Are Risky for Cracked Windshields

A cracked windshield is structurally weaker than an intact one, and car washes introduce several factors that put additional stress on that weakness:

- High-pressure water: Automated car washes use pressurized water jets that hit the windshield at force. That pressure can push water into an existing crack, widening it and potentially causing it to spread during or after the wash.

- Temperature changes: Many car washes use hot water or steam in the wash cycle followed by a cold rinse or ambient air drying. That rapid shift in temperature puts thermal stress on the glass, the same mechanism that causes cracks to spread in extreme weather.

- Mechanical contact: Soft-touch and brush car washes make physical contact with the windshield. The pressure and movement of brushes against damaged glass can flex the windshield enough to extend a crack, particularly edge cracks or long cracks that already span a significant portion of the glass.

- Water infiltration: If a crack has already compromised the seal between the glass layers, water entering the damage can accelerate delamination of the plastic interlayer, making the damage harder and more expensive to repair afterward.

Does the Type of Car Wash Matter?

Yes, though no type of automated wash is completely risk-free for a cracked windshield.

- Touchless car washes are the lowest risk option since there is no mechanical contact with the glass. However, high-pressure water jets can still force water into cracks and the temperature differential from hot water to cold rinse cycles still applies.

- Soft-touch or brush washes are higher risk because physical contact adds mechanical stress directly to the damaged area. If you have a crack longer than a few inches or an edge crack, a brush wash significantly increases the chance of the damage spreading.

- Pressure washing at home carries similar risks to an automated wash. The pressure, temperature, and angle of the spray all affect how much stress is placed on the damaged area.

- Hand washing with a gentle hose is the safest option if you need to clean your vehicle before the damage is repaired. Use low water pressure, avoid directing the stream directly at the crack, and skip hot water.

What Types of Damage Are Most at Risk

Not all windshield damage carries the same risk in a car wash. Here is how different types of damage compare:

- Small chips away from the edge: The lowest risk category. A single chip smaller than a quarter with no visible cracking is unlikely to worsen significantly from a touchless wash, but it is still not advisable.

- Chips with spreading cracks: Any chip that has already begun to crack is at meaningful risk of the crack extending under car wash conditions.

- Edge cracks: These are the most vulnerable in a car wash. Edge cracks already compromise the structural bond between the windshield and the frame. Any additional pressure, water infiltration, or temperature change can cause rapid spreading.

- Long cracks: A crack longer than six inches spans enough of the windshield that the flex and pressure of a car wash can cause it to move in either direction.

What to Do If You Need to Clean Your Car Before Getting It Repaired

If your windshield is damaged and you need to clean your vehicle before you can get to a repair appointment, hand washing is the safest approach. Use a gentle stream of water at ambient temperature, avoid directing water pressure directly at the crack, and do not use hot water. Skip the automated wash entirely until the damage has been repaired or replaced.

If moisture has already entered the crack, avoid using your defroster on high heat directed at the damaged area before the repair, as the temperature change can cause further spreading.

Get Your Windshield Repaired Before Your Next Wash

At Safelite, most repairs are completed in 30 minutes or less, and we offer mobile service that comes to your home or office. Our technicians can assess your damage and tell you whether repair or replacement is the right call. Schedule your service today and get back to your normal routine.

Frequently Asked Questions

Q: Will a car wash make a windshield crack worse?

A: It can. High-pressure water can force its way into an existing crack, widening it from the inside. Temperature changes between hot wash water and cold rinse cycles create thermal stress that can extend a crack. Mechanical brush contact adds direct physical pressure to the damaged area. The risk depends on the size and location of the crack, but no automated wash is completely safe for a cracked windshield.

Q: Is a touchless car wash safe for a cracked windshield?

A: It is lower risk than a brush wash since there is no mechanical contact with the glass, but it is not without risk. High-pressure jets can still push water into a crack, and temperature changes during the wash cycle can cause existing damage to spread. Hand washing with gentle, cool water is the safest option until the damage is repaired.

Q: Can water from a car wash damage a windshield repair?

A: Yes. If you have recently had a chip or crack repaired with resin, most technicians recommend waiting at least an hour before exposing the repair to water, and longer before going through an automated wash. The resin needs time to cure fully before it can withstand the pressure and temperature of a car wash.