I've owned white cars for the last 17 years. I wash my cars every two weeks and wax them twice per year (spring and fall) and I have yet to see any speckles of rust. I do encounter little speckles of tar which comes off when I wash my cars.

The only down side of white cars is that tar shows up like dirt on a black car and they tend to blend in with snow on the ground.

The advantage of white cars is the ease of keeping them clean and much more comfortable getting into a white car in the summer then a black car.

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Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles