During the warranty period, you can ask for after-sales warranty. After the warranty period, you can only go to the sheet metal shop for rust removal.

Because the frosted wax attached to the window strip is not spray paint, water may enter between the film and the iron sheet after a long time of film pasting, and then the iron sheet will rust.

Go to the sheet metal shop to deal with it, it should be within 100 yuan, just derusting and spraying primer.