Kia Optima Hybrid 2017 Owner's Manual page 643

Maintenance
Cleaning the interior window glass
If the interior glass surfaces of the ve‐
hicle become fogged (that is, covered
with an oily, greasy or waxy film), they
should be cleaned with a glass cleaner.
Follow the directions on the glass
cleaner container.
CAUTION
Do not scrape or scratch the inside
of the rear window. This may result
in damage of the rear window de‐
froster grid.
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