1993 Chevrolet Corvette Owner's Manual - Page 300

Flush OII any dust and dirt on the window with water. Clean a small area of the window at a time using water only. With a clean cotton cloth, wipe the window using an up-and-down or side-to-side motion. Keep changingto a clean section of the cloth. In the winter,when you need to get frost, snow or ice from the plastic window, you can use warm water if you have to, but never use a scraper or de-icer. If you put things on your plastic rear window-things like stickers, labels, decils, or masking tape-they can be really hard to take off the plastic, and you can easily scratch it while you're trylng to get them off.