Any recommendations for removing white stains on the 8 ft. Corrugated Galvanized Steel Utility-Gauge Roof Panel?

Unfortunately, the white stains are permanent, as the panels age they will become less noticeable but depending on the severity will always be visible.

Unfortunately, the white stains are permanent, as the panels age they will become less noticeable but depending on the severity will always be visible. Cleaning and painting the panels would be the only way to cover up the white rust.