If your hat is stained, a leather dressing can be applied to the outside of the hat. The leather dressing will darken the hat, mask the stain, and make the hat more waterproof. If you're just removing a small mark on the hat, sometimes rubbing the area firmly with your thumb can erase the mark. Also, you can try chalk that is a similar color to the hat. This can soak up an oil mark. Afterwards, rub the chalk off the hat.
Quality ,functional style and looks great .I have to admit I had never heard of Conner hats.I stumbled on their website trying to find weather protection that had some durability (landscaping).Man,do I appreciate quality and cratsmanship at a fair price.Hats off to Conner or hats on in this case.