Want a little extra stealth? Try this...
Keep a bottle of rubbing alcohol in your tackle box and wipe down your fluorocarbon leader from time to time. A quick wipe will remove any surface dust or grime that may be clinging on to your leader, and also temporarily removes any cloudiness in your leader as well.
Pro Tip: Always replace fluorocarbon leaders when they show any abrasion, chaffing, or wear. As soon as fluorocarbon becomes chaffed it loses all of invisibility properties.