I thought mine was on the inside also.. But I got the 3M kit and was bown away on how good of a job it did restoring the headlghts. They look brand new again. After I was done i mixed a 1/2 cup of Urithane an Mineral spirts and coated the lenes to protect them from UV.. They look amazing.

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2000 X5

1999 Z 3 2.3
1994 Dodge 1500 4x4
1990 Jeep Wrangler
1947 Dodge p/u 4x4 small block