Rust!!!
 

does anyone know the best way to get rid of rust above the rear winsheild of a 69 mustang? Any info you migh have would be helpful thanks.

The only way to get rid of rust is to cut it out and weld in a patch. Above the rear window is a problem since I'm not aware of any patch panels for that area. So you may be looking at cutting patches from a parts car.
If patching is not an option, then clean out all the rust, treat the area with a rust converter like Rass O Nill, then use fiberglass to patch the area. Not a good option.
Good luck.

How bad is the rust? If it is surface rust you can treat it and then fiberglass but of course welding in new metal is the ultimate fix.

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69 351W Sportsroof deluxe