another claying window thread

after claying my windows with a medium grade bar. i still cannot get the wiper marks off the windshield. windows are clean but you still see the years worth of where the wiper has been. should i go to a aggressive bar? what are my other safe options for doing this. this is not the original windshield. :help:

 

Claying will not fix this. You will need to get glass polish to correct this.

 

I agree. Claying won't fix it...polish them out...