Question:

Is there a way to remove dirt from windscreen damage?

Answer:

Chip savers are a good option for preventing liquid and solid contaminants from entering the damage but once contaminates have entered the damage your options are limited to using filtered compressed air and a steel scribe to remove contamination on or near the surface, but alcohol, acetone, solvents, and even water, may compromise the integrity of the PVB „laminate“, so Delta Kits does not recommend using any type of liquid to clean or dry damage below the surface.