Scratched camera lens LG G2 D802 2 months gentile use topic

Was cleaning the LG G2 and when I saw the camera I had a heartattack
Googling this issue I saw many people having scratched camera lens, and some of them have just got broken inside the glass. Mine is "slightly" scratched. I tried to use toothpaste just to try but it didnt work... And my question might be awkard but what toothpaste I need to use? And do I need to use Alcool?