Thin heating elements on the inside of the rear window will quickly provide good visibility.
The rear window heating only functions when the engine is running.
If the rear window is clean, turn off the heating. Long-term operation of the heater leads to a rapid discharge of the battery, especially in dense city traffic. The rear window heating is used only to eliminate fogging of the glass and cannot be used to dry it from raindrops or melt snow.
This material is taken from a resource: toyotaman.ru
When cleaning the inside of the rear window, be careful not to damage the conductive layer of the heater.