Greased Lightning is the best FI cleaner I have come across yet!
Lucas is good and safe as it's a Mild cleaner/lubricant. The greased lightning is powerful and Do NOT idle your vehicle for extended periods of time when using the stuff. You must drive and regulate your throttle as it's Strong stuff.
It's in a black bottle with green lightning bolts. Napa carries the stuff and so does Ksmarts. HERE for a pic
I've used everything under the sun and absolutely swear by the stuff! I've owned 32 cars and all but 2 were used....