Chevrolet 2003 Corvette Owner's Manual page 308

Exterior painted surfaces are subject to aging, weather
and chemical fallout that can take their toll over a
period of years. You can help to keep the paint finish
looking new by keeping your vehicle garaged or covered
whenever possible.
Windshield and Wiper Blades
If the windshield is not clear after using the windshield
washer, or if the wiper blade chatters when running,
wax, sap or other material may be on the blade or
windshield.
Clean the outside of the windshield with a full-strength
glass cleaning liquid. The windshield is clean if beads do
not form when you rinse it with water.
If you use a glass treatment or conditioner containing
ethyl alcohol or ethyl sulfate on your glass, be sure
to remove the acrylic roof panel, if so equipped. These
products may damage the panel.
Grime from the windshield will stick to the wiper blades
and affect their performance. Clean the blade by
wiping vigorously with a cloth soaked in tull-strength
windshield washer solvent. Then rinse the blade
with water.
Removable Roof Panel
Special care is necessary when cleaning, removing
and/or storing the roof panel.
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Flush with water to remove dust and dirt, then dry
the panel.
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Clean the panel with GM Glass Cleaner. Leave the
cleaner on the panel for one minute, then wipe the
panel with a soft, lint-free cloth.
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Don't use abrasive cleaning materials
If water drops are frequently allowed to dry on roof
panel, impurities in the water will adhere to the
top. These impurities may etch or mar the finish. When
the panel gets wet, you should dry it off.
Notice: Do not use a glass treatment or conditioner
containing ethyl alcohol or ethyl sulfate on the
roof panel. These products may damage the panel.
Check the wiper blades and clean them as necessary;
replace blades that look worn.
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