(93 3.1) Is there anything you can use to clean out the radiator overflow tank? Mine (as well as others' I'm sure) is foggy and very difficult to read. I've even tried using a flashlight to see the level, but to no avail. I believe you're supposed to check the fluid level in the radiator itself, not the overflow, but it would still be nice to be able to see how much is in there!! It's about time for a fluid flush and while it's empty, I would like to clean it out so I can read it.