you can't wipe them they will mar and turn black (ask me how i know) the only thing you can do is place soap and water in there and rattle it around and hope that the crap you want out is out. The main reason that gets dirty is your seal between the light and the headlight is not wight and crap is getting behind there into the headlight casing.

2007 Speedmaster and miss it! 2013 T-Bird Storm and Luvin it! Catching a yellow jacket in your shirt at 70 mph can double your vocabulary