Just bought a Shoei XR1000 and when I peeled off the protective film on the visor it has left a zigzag pattern which I assume is some kind of adhesive from the film. Any ideas what to clean it off with? I've tried optical lens cleaner with no success. I'm reluctant to try anything more aggressive like white spirit or meths for far of damaging the hard coating. The layer is very thin, almost imperceptible to the finger, but it interferes with the vision. Thanks.