Does Automatic Car Wash at Gas Stations Damage the Car?

[Lorenzo]

Automatic car wash at gas stations does not damage the car. Here is the relevant introduction about automatic car wash: 1. Car wash process: Before driving into the automatic car wash machine, you must close the windows and sunroof, turn off the engine auto start-stop function, and fold the vehicle's rearview mirrors; when entering the automatic car wash machine, shift the gear to N, release the brake, do not pull the handbrake, there is no need to turn off the engine, and when the green light at the exit of the car wash machine lights up, drive the vehicle out of the car wash machine. 2. Car wash machine materials: Currently, the fully automatic car wash machines on the market use relevant programs to achieve automatic cleaning, waxing, drying, and wheel rim cleaning of the vehicle. The brushes on the car wash machine are made of high composite materials and will not cause damage to the car paint.

[VonLilah]

Last time after driving into the gas station's automatic car wash, I specifically squatted in front of the car to study it for a long time. Those tunnel-style big rotating brushes are indeed powerful - my friend's old Crown's side mirror was squeaking loudly under them. The car wash attendant secretly told me they're most afraid of customers washing cars with antennas, as they can easily get snapped off if not careful. Rubber seals also suffer, especially on cars that are five or six years old - high-pressure water jets forced into the rubber gaps can make the gaps widen over time. But if your car is new, washing it two or three times a month is fine, just remember to remind them to retract antennas and fold mirrors. For those really concerned about paint, choose car washes with water softening treatment to reduce water spot marks.

[DiColton]

Last week I just sent my car through the tunnel wash, only to find a few light scratches on the hood when it came out. The mechanic said there was an 80% chance small stones got stuck in the rotating brushes—those spinning heads work like sandpaper going in circles. My neighbor's white SUV had it worse; after three washes, all the black plastic trims turned chalky white. Now I've learned my lesson and always ask workers to rinse the brushes clean before washing. If you've got a wrap or PPF installed, steer clear—the hot-air dryers and strong detergents can make the edges peel in minutes. But it's super convenient for quick cleanups; when you're in a rush to pick someone up, a five-minute wash beats hand washing any day.

[McSophia]

As a seasoned driver with twenty automatic car washes under my belt, here are three dos and don'ts: choose stations with new curved brush heads, avoid traditional slapping-type car washers; always retract antennas and turn off wipers in advance, never forget to remove temporary license plates; dark-colored cars are better suited for touchless washes, while white cars can be more flexible. Pay special attention to the pH level of the car wash solution—highly alkaline ones corrode rims the fastest. Two years ago, my chrome rims turned yellow after a wash, so now I always apply rim protectant beforehand. With new cars equipped with 360-degree cameras, car wash attendants say water stains on the cameras are the most troublesome.

[OEzra]

From a Car Washer's Perspective: While replacing the brushes on the machine this morning, I found three small rocks lodged in them. The biggest car-damaging culprits in automated washes are overlooked foreign objects, especially gravel stuck in off-road vehicle tires. I've handled cases of broken shark fin antennas, deformed roof rack clips, and panoramic sunroof seals torn off by the brushes. I recommend taking two minutes before a wash to walk around your car and kick out any stones stuck in the wheel wells. Also, vehicles with large rear spoilers should avoid tunnel washes - last week a modified car had its spoiler cracked clean off. Pay special attention in winter: water frozen in door seams from sub-zero washing can make doors impossible to open the next morning.

[McSadie]

From a mechanical perspective, the 150 RPM rotating brush exerts force equivalent to rubbing the car paint with a towel twice per second. Laboratory data shows that PBT material in ordinary car wash brushes can trap particles, akin to using fine sandpaper for surface treatment. When nozzle impact force reaches 80 bar, it's sufficient to loosen aged sealing strips. Particularly at vehicle corners, the washing arm applies the most concentrated pressure on hard-to-reach areas. However, contactless car wash's high-pressure water jets actually cause more paint damage, especially on repainted areas which are prone to chipping. A compromise is visiting semi-automatic stations, where you pre-rinse road debris off the vehicle before machine washing.