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Is the dirt not coming off when you wash the car? (Two bucket method obviously)
If I've ever had any stubborn bugs I tend to use a bit of bug/tar remover or APC but I've never had an issue of my MF getting dirty polishing the glass after I've cleaned the car.
If I've ever had any stubborn bugs I tend to use a bit of bug/tar remover or APC but I've never had an issue of my MF getting dirty polishing the glass after I've cleaned the car.