When I've seen corrosion (rust) on stainless steel parts it's not that usual rusty red/brown color with scale and bubbles built up in areas (if you're old enough to remember the 73 through 88 Chevy pickups and Blazers, you know what I'm talking about). It's usually sort of an off white color and small pits, or small areas of small pits. When you clean it off, the small pits will still be there, if you look closely, but you wont' normally see it if it was caught pretty quick after it started.
I've read a lot of stuff, over the years, on the internet that didn't work that way for me. For example:
Never sharpen a stainless knife blade with the same stone used for a carbon steel knife blade because the carbon steel metal particles left on the stone will embed themselves in the stainless blade and rust. Nope, never happened to me. I use the same Lansky knife sharpening set for every knife I've ever sharpened, carbon steel or stainless. No issues in almost 40 years.
Don't use steel wool on stainless handguns because the little steel particles from the steel wool will become imbedded in the surface of the stainless gun and rust. That hasn't happened to me either. That Colt 1911 I mentioned earlier is still just as pretty as it was almost 20 years ago when I bought it.
Other people may have had different experiences.