How to clean a clear iphone case?

I have a clear case and it's kind of reddish brown around the corners. I tried washing it in soap and water and that didn't work and I also tried alcohol. The discoloration is still there! Is there a foolproof was to get rid of it?

Try a wipe or get some sprays… If that doesn't work then I don't know what will so you may need to buy a new one.