Hey, nah the deflectors are there to minimise wind resistance onto the wheels so they won't have any effect on this. I'm guessing this is just dirt/mud which has been picked up off the road.
Have they appeared only after it has rained or you have driven over a wet road?
I have noticed some dirt spray up from the wheels onto the side of the car behind the rears but it's hard to see how much there is because mine is black.
The mud guards would be the best option to avoid this (or minimise).
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