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Brown (rust?) spots on floor next to inside front wheels both sides

  • 2014
  • Cayman
Mileage: 
35 000
Body
Suspension
Sonoma, 
California

Two days sitting in garage after a 100 mile road trip, found several 1" diameter brown spots on floor next to inside side of wheel/tire, both left and right front. Spots are dry and do not have oily feel.   Spot shape has a plop look.  Washed car 4-5 days before.  If it is residual car wash water, what would turn it brown or rusty?

Road trip did not encounter wet weather or wet roads.   

How many Porsches have brown spots on their garage floor or driveway?

Thanks, 

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