Chevrolet Corvette 2013 Owner's Manual page 60

2-30 Keys, Doors, and Windows
Wet the entire vehicle and wash the
top evenly to avoid spots or rings.
Let the soap remain on the fabric for
a few minutes. When the top is
really dirty, use a mild foam-type
cleaner. Thoroughly rinse the entire
vehicle, then let the top dry in direct
sunlight.
To protect the convertible top:
After washing the vehicle, make
sure the convertible top is
completely dry before lowering it.
Do not get any cleaner on the
vehicle's painted finish; it could
leave streaks.