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Seriously it's not dirty but this glass was scratched by the wiper.
I like your original shot with the star bursts. It is much harder to get nice-looking star-bursts than to eliminate them by opening up the aperture.
My picture is a sunrise when there wasn't much light, but I saw the opportunity to get a star burst of the rising sun AND its reflection in the lake. Shot with 7D and 17-85 at 59mm at ISO 100 at f/32 and 1/20 sec.
Yup, it's all about aperture, the lower the less burst and the higher the more. Shot this a few summers ago with a sigma 100-300mm at 300mm on an aps-c so 450mm equivalent at f7 for 30 seconds. This was the very last of the light from sunset, and in this case the starburst off the lighthouse really makes the shot for me, so using this knowledge to your advantage can really help you make or break a shot...