If it's on the outside of the lens, it should be repairable by them. If it's on the inside, the camera was compromised, and needs to be replaced. The lens is similar to material for the headlamps. Able to withstand bugs, sand blasting and rocks to a point. I provided to you how I would go about it. No guarantees, no prior experience on the camera lens.
I did have the lens restoration done on my 06' LS430 last month. I came away very impressed from the process and finish.
I didn't stay at a Holiday Inn Express last night though, so my opinion may be fodder