Stainless steel contains chromium, a durable metal that helps prevent rust and corrosion. When exposed to oxygen and heat, a thin, protective oxide layer forms on the surface, causing a slight discoloration or rainbow effect.[1] However, there’s no need to worry – this can be easily removed. Simply apply some club soda or vinegar to the affected area, then gently polish with a soft cloth, following the grain of the stainless steel. Rub until the discoloration disappears, then rinse with warm water and dry thoroughly. [2]

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Source:
[1] https://www.tasteofhome.com/article/discoloration-of-stainless-steel/?srsltid=AfmBOoq35rCtEoApFn0sD17zQ8zDb6NAZQYKQnt9asNkmI9m-5viHArG
[2] https://www.fireplacedoorsonline.com/got-discoloration.html?srsltid=AfmBOoo9FKwxS49seJvzW1RC2DngP6gu_-PimIC6N4m1Tr-PUa3fqsoR