Took some super fine steel wool to the tunnel on the left side, the first two pics are before & after. I did it with super fine steel wool dry then with the super fine steel wool with a spray bottle, like wet sanding. The last two pics are the left side (done with super fine steel wool) the right side is cleaned up with SLEDBRITE tunnel cleaner. Once I polish it up then put a sealant on it they should look great. I still have another hour or two on the side I worked on tonight, then I'll polish them after we have the engines checked out.