Certain helmets make shield removal tricky, so learn the drill in the comfort of your living room-not under a dark freeway underpass. It's easiest with a clear shield, since you can see how the shield and helmet mechanisms interact. Said mechanisms work better without the inevitable accumulation of road grunge and bug guts, too. That can of Dust Off you use to clean your computer keyboard helps here, and it just might unblock the vents that quit venting last August. When it comes to cleaning your face shield, start with the cheapest, safest, least invasive solution known to man: warm water. Arai reps say anything stronger will compromise the polycarbonate structure's ability to survive a nasty impact. Follow up with the cleanest, softest micro-fiber cloth in your arsenal. Gently. Do not use a dry paper towel. The tiny scratches it leaves will remind you never to do that again! If you must use a paper towel, wet it first, then dab, don't wipe.