Anytime the Discs get wet, they'll gain a layer of surface rust very quickly, it's not your Wheel Cleaner. First application of the brakes wears it off - no problem at all.
Some people paint the Hats and edges of their discs so these do not rust, because rust on those areas is not worn off by the brake pads.
Check your cleaner to make sure it doesn't have any acid, ammonia or silicone. Your wheels are painted and don't like that stuff, but there are cleaners out there which contain it. Make sure it says Safe for Painted or Clearcoated wheels and you're good.
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