Alloys ruined?

After a quick detail yesterday, I was drying my wheels and when I later went to put the car in the garage the left side wheels appeared to have lost their glossy black look..

Here are all 4 wheels taken just now, the right side is glossy, the left side looks matte.. Can someone explain this please!? :worried: Will a rotary sort it? :S

LEFT
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RIGHT
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A good machine polish and wax should bring it back up.
what did you use to clean them.?
 
A good machine polish and wax should bring it back up.
what did you use to clean them.?

Just some bilberry wheel cleaner with a wheel brush, or autobrite snow foam, or megs gold shampoo and a wash mitt.

Don't understand why it's only left side though? Just chance.. :S
 
left side is in the gutter so will get more grime.

strong wheel cleaner and then clay will bring them back up.

use a good seal to help prevent it happening again.