Without pictures, I'd guess burned paint. I recently detailed a Turbo Porsche in metallic gray that the "authorized" dealer had detailed. They burned 2 spots on the passenger side (door and quarter) and now those areas appear silver. That comes from using a rotary too hard and actually burning the area's clear coat.
More common in this situation is the clear starting to go bad.
Spoilers tend to do this before other parts due to their sun exposure, the material they're made of, and (with aftermarket) the quality of material sprayed on them.
No, more likely if it's clouds on a clear-coated finish, then it's paint failure.
If it's just cloud-y, as in a not-shiny finish, then it could just use some good polishing.
If the paint is single stage and oxidized, it wouldn't be cloudy as much as it would just dull, due to silver single stage's composition as opposed to black or red.
The car has never seen a rotary buffer or any thing like that.
the paint is still very shinny but if i stand a foot or so behind car and look at spoiler there are spots resembling clouds.
If i step closer so now i am looking directly down at the spoiler it looks great i can see clear metallic paint. Not sure if it matters but it is a 2002 Acura 3.2 tl.