Cal,
The dashboard conditioner I typicaly use is not “aerosol”, it’s simply a liquid that’s in a pump bottle. I never spray the stuff inside vent openings. I only spray the stuff on large surface areas. For vent areas and tight areas, I soak a rag with the stuff then apply. I’ve been cleaning the dash and console areas on my car which is now 6 years old, and I’m happy to say, it looks like new. I guess if I’m destroying the electrical system, that will be the problem of the next owner. But in the mean time, the dash and console looks new, as do my leather seats.