T-cut and some elbow grease.
also smokers toothpaste (althought i have never tried)
All it is is a film on the outside of the lens.. try having it buffed beffore going to the hassle of removing lenses.
when i was with my parter we got caught 3 times.. whoops!
battered her eye lids and let us off!
that was when we were tight for money after she spent it all