This will also quicken cabin heating warm up for passenger comfort and window defrosting. The Stirling engine is used for cabin heat, windshield defrosting and battery recharging. There are microwave ovens on the market that allow full-power defrosting. An auxiliary gasoline heater with a one-gallon tank provided heat and defrosting. ITO films deposited on windshields are used for defrosting aircraft windshields. In winter there is generally frost along with defrosting. Therefore, unlike frost-free units, direct-cool units require manual defrosting of the interior. The car had good ventilation and defrosting systems. The 1950s and 1960s saw technical advances like automatic defrosting and automatic ice making. Such films are under development for thin-film heaters, such as for defrosting windows or sidewalks. The Ice King in turn begins defrosting Finn and Jake by sitting on them. The surface appears covered with dark spots when this defrosting process is occurring. Display lights and sound tones alert users when defrosting and other maintenance functions are required. LSM full-power defrosting may actually achieve more even results than slow defrosting. The defrosting of soil has caused damages to buildings and roadways.