I put a plastic item in a stainless steel bowl and added bleach. I left it for several days because I was trying to remove some persistent stains from the item.

I put a plastic item in a stainless steel bowl and added bleach. I left it for several days because I was trying to remove some persistent stains from the item. When I checked it, the bleach had corroded through the stainless steel. I would imagine that road salt stuck into seams would, over time, also corrode stainless steel. If there are small gaps, it can get in there and be hard to clean out. Just like getting food caught between your teeth and not flossing.