Arghh! I hate when this happens...the clear plastic gets that orange tint due to the staining of tomato sauce. I just cleaned a bowl that I stored chilli in and the lid is all orange. No matter how much I scrub, it just won't go away. My mother says it's ok, but I have to wonder what effect it has on bacteria? It seems like the oils are now stuck to the lid which could cause bacteria to grow. My mom has always had this problem and never did anything about it, but it still bugs the hell out of me.