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I have a 2011 GS, which is my 3rd Corvette, 2nd C6.
The problem I have which is different from any other car I have owned, is that the inside of the windshield needs cleaning about once a week.
I drive this car 3-4 days a week and occasionally take the top out but nothing unusual.
I have been using Invisible Glass to clean so maybe it is leaving a residue that is attracting dirt.
I even checked the incabin filter and it was clean (4900 miles).
Good suggestions here, but I have a question. If you are using a cloth or microfiber towel, have they been washed? If you are washing with your clothes and using fabric softener, it will leave an oily film behind that will attract dirt. Your car detailing rags, towels, microfiber or whatever, can be washed as usual, but don't ever use fabric softener. The plastic in your car is made from petroleum products that outgas as they age and leave a film on the glass.
I've seen cars that have a heater core leak cause that to happen. Sometimes you can smell a sweet smell in the car. Look for wet area's in floors.
THANKS RAYZZZ MY CORVETTE LIKES MY MONEY