If the windshield replacement problem lies on the inside of your headlights you might need a more complex fix. Removing the casing is a tricky business. A professional headlight restoration service can easily remove the casing without damage and can clean and buff any scratches out of the inside as well as the outside, leaving them looking like new. You may want to shop around and for the best price.
Automobiles are made so that a cracked windshield can be replaced; they are not made to be repaired. To my knowledge, manufacturers do not recommend or promote repairing windshields they recommend replacing them. A windshield is a structural part of the body and is in place for safety reasons. You shouldn't mess with the overall safety of the car by repairing a glass that is vital to safety during a rollover or accident.
Why do you think there is windshield repair? You got it, cost. Some insurance companies want you to repair rather than replace because of cost. They save a fortune if you repair your windshield. Also, you need to check with your state as to what is legal as far as windshield repair all states have different laws regarding this issue.
Test your lights. If you notice an improvement-you are done! If it still appears dim or cloudy, you may want to use a special plastic cleaner and wax to give it a higher polish and sheen. These can be purchased at fix auto glass repair repair stores. When using them, be careful not to get any on the rest of the car as it could cause damage. Some masking tape around the headlight border can help protect it. You may want to use a rotary buffer to ensure the smoothest polish possible.
There are various ways in which the glass can be damaged. The windshield is made and kept under high stressed areas when fitted. Plus it has very high density. Because of this, even a small crack poses high danger for the glass. Ignorance of even a minor vein in the glass leads to damage.
Sometimes the weather stripping or window channel is torn and falling apart. This can jam the window or prevent it from moving the way it should. Also look for objects that might be jammed into the window path. There may be too much friction between the glass and the channel. You can lubricate the channel with silicone spray.
Convertible tops last about eight years. Check that the cover is not in contact with the frame which could cause damage. If you can see scratches on the rear window, visibility will be bad. Also a crease in the window could hinder the view. The crease can be prevented by placing a towel in the fold, so the window can not be compressed.