You want to seek out defects that you can't see in normal lighting conditions for a vehicle you drive daily?
What I would do: Polish the whole car with a medium polishing pad and m205. It's going to remove light imperfections and return shine/gloss. If this was a show car and never gets driven, then I would address the defects because once they're removed, there is a good chance they will never be scratched again because the car doesn't get used, therefore being washed less also.
How to solve your problem: If you really want to get crazy buy 3-5 different lights, all different types and strengths. Move the light around and your line of sight, you'll be able to find all the defects. Similar lighting arrangements are also used to look for Big Foot.
Here's an example:
I usually you three sources of light to check my work. Fluorescent lights, an LED flash light and the sun.
**light used: Streamlight 74301 Strion LED Flashlight
I'm also only doing this for paint correction work.