This story originally appeared on Business Insider.
Some Tesla owners say their Cybertrucks are starting to rust after getting caught in the rain.
In a post on the Cybertruck Owners Club forum, a member with the username Raxar wrote that he picked up the vehicle on February 1 and was warned that day that rain might cause it to rust.
“The consultant specifically mentioned that Cybertrucks develop orange rust marks in the rain and this required the vehicle to be polished,” the forum member wrote. “I know I’ve heard the story about never taking your Delorean out in the rain, but I’ve never read anything about rust and Cybertrucks.”
In another post, Raxar said the car started developing rust spots after just two days in the rain.
The user also shared photos of what he said were small specks of rust on the car’s stainless steel body. The user said the photos were taken after a “wash with dish soap.”
According to Mead Metals, a Minnesota metal services company, stainless steel is prone to rust in certain environments. A blog post on its website states that rust is often the result of exposure to water, although it can also be caused “by exposure to harmful chemicals, saline, grease, or prolonged exposure to heat.”
Vertigo3pc, another member of the Cybertruck Owners Club forum, wrote Monday that he took his Cybertruck to a service center to have it checked after it rained in Los Angeles. “I noticed corrosion forming on the metal like other people have noticed,” they wrote, “so I decided to start documenting it and bringing it to Tesla’s attention.”
The forum member added that the service center employee “documented the corrosion” and said they could repair the damage.
Vertigo3pc also posted images of what they said were corrosion spots on the Cybertruck. “Stains are definitely everywhere in the metal,” they said.
Elon Musk said the Cybertruck was “literally bulletproof” with its “ultra-strong stainless steel” body when he revealed the electric vehicle in 2019.
Elon Musk at a Cybertruck event. Tesla via BI
In a post on X in September, Musk said Tesla may be able to offer owners an option to get a tungsten carbide coating, a ceramic material that helps protect against corrosion. He added that the coating was “essentially resistant to scratches and anything less than diamond hardness.”
In two YouTube videos, the authors claimed to have access to the Cybertruck’s user manuals (which Tesla has not shared publicly). Materials shown in the videos say the EV has “no clear coating” on its stainless steel outer body.
The videos give a glimpse of the owner’s apparent guidance, which says: “To avoid exterior damage, immediately remove corrosive substances (such as grease, oil, bird droppings, tree resin, dead insects, tar stains, road salt , industrial repercussions, etc.).”
Tesla did not immediately respond to a Business Insider request for comment outside of normal business hours.