bad windshield wiper scratched windshield..
 

whats the best product/way to get this scratch out? I just bought the car like 3 weeks ago and it was like that when i bought it...

Suggest a Google search on removing scratches on glass or glass polishing.

The issue is going to be how deep the scratch is. Polishing/reparing can only remove some much material. If your finger nail catches on the scratch it may be too deep to successfully polish out.