They don’t need to be seasoned, in fact, I’m not even sure if seasoning them would ‘take’ (being stainless steel).
I have a set of Viking stainless steel pots and pans that I absolutely adore. I’ve had them for nearly 15 years and other than some scratches on the bottom from metal utensils, they look just about brand new. Brainy_Deep mentioned Barkeeper’s friend, which I’ve used and it work. But honestly, there’s no harm at all with just tossing them in the dishwasher. They generally come out good as new.
I swear, you’d have to actively try to destroy these things…like run them over with a car or put them in a blast furnace and melt them.
Mine (again, Viking) were very expensive, but so far have been a very good investment. They don’t get dirty, nothing sticks to them, you can’t hurt them, there’s no teflon to peel off, they don’t rust, they’re very easy to clean (by hand or in the dishwasher).
If I bought some ‘regular’ pots and pans 15 years ago, they likely would have been replaced at least once. I do have some cheapo ‘regular’ ones that are just as old, but the exterior is SS and copper (or maybe a copper alloy).
The other nice thing about good set of SS pots and pans is that the handles are SS and very firmly attached. Which means they won’t snap off one day, they don’t melt on a gas stove and you can toss the entire thing in the oven if you need to.
Having said that, while checking my old posts here to double check the brand (because I know I’ve posted about them a few times in the past), I see that mentioned not to cook eggs on them. I don’t cook eggs, but I understand that requires teflon. Apparently they’ll stick to SS.