Staining from cooking rice

Is there anyway to prevent this? Figure boiling a vinegar solution will get rid, but just wanted to check if there were any preventative measures.

Also, I'm learning that for something called "stainless", these pans get stained if you just look at them funny

Is there anyway to prevent this? Figure boiling a vinegar solution will get rid, but just wanted to check if there were any preventative measures.

Also, I'm learning that for something called "stainless", these pans get stained if you just look at them funny